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Finding the Fourth Proportional to 125,128.61, 187,720.60 and 68,939.78

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Solution

The fourth proportional to 125,128.61, 187,720.60 and 68,939.78 is: 103,424.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,128.61 : 187,720.60 = 68,939.78 : x
  2. Step 2: Convert to fraction form
    125,128.61/187,720.60 = 68,939.78/x
  3. Step 3: Cross multiply
    125,128.61x = 187,720.60 × 68,939.78
  4. Step 4: Simplify right side
    125,128.61x = 12,941,417,162.42
  5. Step 5: Solve for x
    x = 12,941,417,162.42/125,128.61
  6. Step 6: Final answer
    x = 103,424.93

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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.