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Finding the Fourth Proportional to 349,287.20, 523,930.80 and 86,631.20

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Solution

The fourth proportional to 349,287.20, 523,930.80 and 86,631.20 is: 129,946.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    349,287.20 : 523,930.80 = 86,631.20 : x
  2. Step 2: Convert to fraction form
    349,287.20/523,930.80 = 86,631.20/x
  3. Step 3: Cross multiply
    349,287.20x = 523,930.80 × 86,631.20
  4. Step 4: Simplify right side
    349,287.20x = 45,388,753,920.96
  5. Step 5: Solve for x
    x = 45,388,753,920.96/349,287.20
  6. Step 6: Final answer
    x = 129,946.80

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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.