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Finding the Fourth Proportional to 655,958,288.95, 905,233,193.31 and 391,663,377.61

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Solution

The fourth proportional to 655,958,288.95, 905,233,193.31 and 391,663,377.61 is: 540,501,882.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    655,958,288.95 : 905,233,193.31 = 391,663,377.61 : x
  2. Step 2: Convert to fraction form
    655,958,288.95/905,233,193.31 = 391,663,377.61/x
  3. Step 3: Cross multiply
    655,958,288.95x = 905,233,193.31 × 391,663,377.61
  4. Step 4: Simplify right side
    655,958,288.95x = 354,546,690,011,954,496
  5. Step 5: Solve for x
    x = 354,546,690,011,954,496/655,958,288.95
  6. Step 6: Final answer
    x = 540,501,882.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.