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Finding the Fourth Proportional to 83.39, 124.07 and 81.50

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Solution

The fourth proportional to 83.39, 124.07 and 81.50 is: 121.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.39 : 124.07 = 81.50 : x
  2. Step 2: Convert to fraction form
    83.39/124.07 = 81.50/x
  3. Step 3: Cross multiply
    83.39x = 124.07 × 81.50
  4. Step 4: Simplify right side
    83.39x = 10,110.68
  5. Step 5: Solve for x
    x = 10,110.68/83.39
  6. Step 6: Final answer
    x = 121.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.