Finding the Fourth Proportional to 738,145,418.90, 1,107,218,128.35 and 431,279,575.70
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Solution
The fourth proportional to 738,145,418.90, 1,107,218,128.35 and 431,279,575.70 is: 646,919,363.55
Step by Step Solution
- Step 1: Write the proportion equation
738,145,418.90 : 1,107,218,128.35 = 431,279,575.70 : x - Step 2: Convert to fraction form
738,145,418.90/1,107,218,128.35 = 431,279,575.70/x - Step 3: Cross multiply
738,145,418.90x = 1,107,218,128.35 × 431,279,575.70 - Step 4: Simplify right side
738,145,418.90x = 477,520,564,602,136,064 - Step 5: Solve for x
x = 477,520,564,602,136,064/738,145,418.90 - Step 6: Final answer
x = 646,919,363.55
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Double scale
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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.