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Finding the Fourth Proportional to 709,911.59, 979,717.68 and 387,651.60

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Solution

The fourth proportional to 709,911.59, 979,717.68 and 387,651.60 is: 534,980.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,911.59 : 979,717.68 = 387,651.60 : x
  2. Step 2: Convert to fraction form
    709,911.59/979,717.68 = 387,651.60/x
  3. Step 3: Cross multiply
    709,911.59x = 979,717.68 × 387,651.60
  4. Step 4: Simplify right side
    709,911.59x = 379,789,126,200.29
  5. Step 5: Solve for x
    x = 379,789,126,200.29/709,911.59
  6. Step 6: Final answer
    x = 534,980.88

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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.