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Finding the Fourth Proportional to 710,987.71, 981,166.50 and 388,697.82

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Solution

The fourth proportional to 710,987.71, 981,166.50 and 388,697.82 is: 536,404.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,987.71 : 981,166.50 = 388,697.82 : x
  2. Step 2: Convert to fraction form
    710,987.71/981,166.50 = 388,697.82/x
  3. Step 3: Cross multiply
    710,987.71x = 981,166.50 × 388,697.82
  4. Step 4: Simplify right side
    710,987.71x = 381,377,279,607.03
  5. Step 5: Solve for x
    x = 381,377,279,607.03/710,987.71
  6. Step 6: Final answer
    x = 536,404.88

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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.