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Finding the Fourth Proportional to 83,138.40, 124,785.90 and 43,723.80

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Solution

The fourth proportional to 83,138.40, 124,785.90 and 43,723.80 is: 65,626.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,138.40 : 124,785.90 = 43,723.80 : x
  2. Step 2: Convert to fraction form
    83,138.40/124,785.90 = 43,723.80/x
  3. Step 3: Cross multiply
    83,138.40x = 124,785.90 × 43,723.80
  4. Step 4: Simplify right side
    83,138.40x = 5,456,113,734.42
  5. Step 5: Solve for x
    x = 5,456,113,734.42/83,138.40
  6. Step 6: Final answer
    x = 65,626.88

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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.