Finding the Fourth Proportional to 918,129.70, 1,377,194.55 and 420,465.70
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Solution
The fourth proportional to 918,129.70, 1,377,194.55 and 420,465.70 is: 630,698.55
Step by Step Solution
- Step 1: Write the proportion equation
918,129.70 : 1,377,194.55 = 420,465.70 : x - Step 2: Convert to fraction form
918,129.70/1,377,194.55 = 420,465.70/x - Step 3: Cross multiply
918,129.70x = 1,377,194.55 × 420,465.70 - Step 4: Simplify right side
918,129.70x = 579,063,070,501.94 - Step 5: Solve for x
x = 579,063,070,501.94/918,129.70 - Step 6: Final answer
x = 630,698.55
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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.