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Finding the Fourth Proportional to 125,781.30, 188,890.65 and 66,732.30

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Solution

The fourth proportional to 125,781.30, 188,890.65 and 66,732.30 is: 100,214.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,781.30 : 188,890.65 = 66,732.30 : x
  2. Step 2: Convert to fraction form
    125,781.30/188,890.65 = 66,732.30/x
  3. Step 3: Cross multiply
    125,781.30x = 188,890.65 × 66,732.30
  4. Step 4: Simplify right side
    125,781.30x = 12,605,107,523.00
  5. Step 5: Solve for x
    x = 12,605,107,523.00/125,781.30
  6. Step 6: Final answer
    x = 100,214.48

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1.5x scale

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.