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FRO3 is a calculator application published by Daniel Batista Bueno that automates the mathematical Rule of Three, the classical method used to solve problems involving direct and inverse proportions. The software is currently at version 1.0.2, and two versions of the application have been released to date, indicating that the publisher has issued at least one update beyond the initial release. The purpose of FRO3 is to take three known proportional values supplied by the user and compute the unknown fourth value, eliminating the need to perform the cross-multiplication and division steps manually. The tool covers both direct proportions, in which two quantities increase or decrease together at the same rate, and inverse proportions, in which one quantity increases as the other decreases, a distinction that is a common source of error when the calculation is done by hand. FRO3 falls within the category of educational and utility software, specifically mathematical calculation tools. Its use cases include everyday proportional reasoning tasks such as scaling recipe quantities, converting between related units, estimating time or material requirements based on known rates, and completing percentage-style comparisons, as well as academic contexts in which students learning proportional reasoning can verify their manual work. Teachers and learners working through arithmetic exercises involving direct and inverse relationships can also use the application as a quick reference to confirm results. Because the Rule of Three underlies a wide range of practical computations in commerce, cooking, construction, and classroom mathematics, a dedicated calculator of this kind serves anyone who regularly encounters proportional problems and wants a fast, reliable result. The existence of two released versions suggests ongoing maintenance of the software by its publisher, with version 1.0.2 representing the most recent iteration of the FRO3 calculator.
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