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Finding the Fourth Proportional to 655,958,287.70, 905,233,191.59 and 391,663,376.36

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Solution

The fourth proportional to 655,958,287.70, 905,233,191.59 and 391,663,376.36 is: 540,501,880.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    655,958,287.70 : 905,233,191.59 = 391,663,376.36 : x
  2. Step 2: Convert to fraction form
    655,958,287.70/905,233,191.59 = 391,663,376.36/x
  3. Step 3: Cross multiply
    655,958,287.70x = 905,233,191.59 × 391,663,376.36
  4. Step 4: Simplify right side
    655,958,287.70x = 354,546,688,204,793,728
  5. Step 5: Solve for x
    x = 354,546,688,204,793,728/655,958,287.70
  6. Step 6: Final answer
    x = 540,501,880.77

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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.