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Finding the Fourth Proportional to 138,588.60, 207,834.30 and 72,006.60

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Solution

The fourth proportional to 138,588.60, 207,834.30 and 72,006.60 is: 107,984.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,588.60 : 207,834.30 = 72,006.60 : x
  2. Step 2: Convert to fraction form
    138,588.60/207,834.30 = 72,006.60/x
  3. Step 3: Cross multiply
    138,588.60x = 207,834.30 × 72,006.60
  4. Step 4: Simplify right side
    138,588.60x = 14,965,441,306.38
  5. Step 5: Solve for x
    x = 14,965,441,306.38/138,588.60
  6. Step 6: Final answer
    x = 107,984.65

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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.