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Finding the Fourth Proportional to 125,394.59, 187,770.74 and 69,172.20

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Solution

The fourth proportional to 125,394.59, 187,770.74 and 69,172.20 is: 103,581.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,394.59 : 187,770.74 = 69,172.20 : x
  2. Step 2: Convert to fraction form
    125,394.59/187,770.74 = 69,172.20/x
  3. Step 3: Cross multiply
    125,394.59x = 187,770.74 × 69,172.20
  4. Step 4: Simplify right side
    125,394.59x = 12,988,514,835.57
  5. Step 5: Solve for x
    x = 12,988,514,835.57/125,394.59
  6. Step 6: Final answer
    x = 103,581.15

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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.