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Finding the Fourth Proportional to 125,988.20, 188,723.10 and 86,589.80

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Solution

The fourth proportional to 125,988.20, 188,723.10 and 86,589.80 is: 129,706.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,988.20 : 188,723.10 = 86,589.80 : x
  2. Step 2: Convert to fraction form
    125,988.20/188,723.10 = 86,589.80/x
  3. Step 3: Cross multiply
    125,988.20x = 188,723.10 × 86,589.80
  4. Step 4: Simplify right side
    125,988.20x = 16,341,495,484.38
  5. Step 5: Solve for x
    x = 16,341,495,484.38/125,988.20
  6. Step 6: Final answer
    x = 129,706.56

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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.