Finding the Fourth Proportional to 1,278,117,431.20, 1,917,176,146.80 and 501,363,265.60
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Solution
The fourth proportional to 1,278,117,431.20, 1,917,176,146.80 and 501,363,265.60 is: 752,044,898.40
Step by Step Solution
- Step 1: Write the proportion equation
1,278,117,431.20 : 1,917,176,146.80 = 501,363,265.60 : x - Step 2: Convert to fraction form
1,278,117,431.20/1,917,176,146.80 = 501,363,265.60/x - Step 3: Cross multiply
1,278,117,431.20x = 1,917,176,146.80 × 501,363,265.60 - Step 4: Simplify right side
1,278,117,431.20x = 961,201,693,690,072,960 - Step 5: Solve for x
x = 961,201,693,690,072,960/1,278,117,431.20 - Step 6: Final answer
x = 752,044,898.40
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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.