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Finding the Fourth Proportional to 83.50, 124.70 and 68.24

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Solution

The fourth proportional to 83.50, 124.70 and 68.24 is: 101.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.50 : 124.70 = 68.24 : x
  2. Step 2: Convert to fraction form
    83.50/124.70 = 68.24/x
  3. Step 3: Cross multiply
    83.50x = 124.70 × 68.24
  4. Step 4: Simplify right side
    83.50x = 8,509.53
  5. Step 5: Solve for x
    x = 8,509.53/83.50
  6. Step 6: Final answer
    x = 101.91

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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.