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Finding the Fourth Proportional to 463,674,672.40, 695,512,008.60 and 428,639,126.80

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Solution

The fourth proportional to 463,674,672.40, 695,512,008.60 and 428,639,126.80 is: 642,958,690.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    463,674,672.40 : 695,512,008.60 = 428,639,126.80 : x
  2. Step 2: Convert to fraction form
    463,674,672.40/695,512,008.60 = 428,639,126.80/x
  3. Step 3: Cross multiply
    463,674,672.40x = 695,512,008.60 × 428,639,126.80
  4. Step 4: Simplify right side
    463,674,672.40x = 298,123,660,045,218,112
  5. Step 5: Solve for x
    x = 298,123,660,045,218,112/463,674,672.40
  6. Step 6: Final answer
    x = 642,958,690.20

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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.