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Finding the Fourth Proportional to 83.38, 124.58 and 80.50

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Solution

The fourth proportional to 83.38, 124.58 and 80.50 is: 120.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.38 : 124.58 = 80.50 : x
  2. Step 2: Convert to fraction form
    83.38/124.58 = 80.50/x
  3. Step 3: Cross multiply
    83.38x = 124.58 × 80.50
  4. Step 4: Simplify right side
    83.38x = 10,028.69
  5. Step 5: Solve for x
    x = 10,028.69/83.38
  6. Step 6: Final answer
    x = 120.28

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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.