Finding the Fourth Proportional to 520,919.20, 781,378.80 and 408,944.80
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Solution
The fourth proportional to 520,919.20, 781,378.80 and 408,944.80 is: 613,417.20
Step by Step Solution
- Step 1: Write the proportion equation
520,919.20 : 781,378.80 = 408,944.80 : x - Step 2: Convert to fraction form
520,919.20/781,378.80 = 408,944.80/x - Step 3: Cross multiply
520,919.20x = 781,378.80 × 408,944.80 - Step 4: Simplify right side
520,919.20x = 319,540,797,090.24 - Step 5: Solve for x
x = 319,540,797,090.24/520,919.20 - Step 6: Final answer
x = 613,417.20
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Double scale
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Similar ratio
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.