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Finding the Fourth Proportional to 135,517.52, 187,021.20 and 81,801.84

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Solution

The fourth proportional to 135,517.52, 187,021.20 and 81,801.84 is: 112,890.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,517.52 : 187,021.20 = 81,801.84 : x
  2. Step 2: Convert to fraction form
    135,517.52/187,021.20 = 81,801.84/x
  3. Step 3: Cross multiply
    135,517.52x = 187,021.20 × 81,801.84
  4. Step 4: Simplify right side
    135,517.52x = 15,298,678,279.01
  5. Step 5: Solve for x
    x = 15,298,678,279.01/135,517.52
  6. Step 6: Final answer
    x = 112,890.78

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1.5x scale

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.