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Finding the Fourth Proportional to 125,791.50, 188,631.90 and 66,613.36

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Solution

The fourth proportional to 125,791.50, 188,631.90 and 66,613.36 is: 99,890.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,791.50 : 188,631.90 = 66,613.36 : x
  2. Step 2: Convert to fraction form
    125,791.50/188,631.90 = 66,613.36/x
  3. Step 3: Cross multiply
    125,791.50x = 188,631.90 × 66,613.36
  4. Step 4: Simplify right side
    125,791.50x = 12,565,404,662.18
  5. Step 5: Solve for x
    x = 12,565,404,662.18/125,791.50
  6. Step 6: Final answer
    x = 99,890.73

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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.