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Finding the Fourth Proportional to 125,640.80, 188,169.60 and 85,983.20

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Solution

The fourth proportional to 125,640.80, 188,169.60 and 85,983.20 is: 128,775.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,640.80 : 188,169.60 = 85,983.20 : x
  2. Step 2: Convert to fraction form
    125,640.80/188,169.60 = 85,983.20/x
  3. Step 3: Cross multiply
    125,640.80x = 188,169.60 × 85,983.20
  4. Step 4: Simplify right side
    125,640.80x = 16,179,424,350.72
  5. Step 5: Solve for x
    x = 16,179,424,350.72/125,640.80
  6. Step 6: Final answer
    x = 128,775.24

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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.