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Finding the Fourth Proportional to 83.12, 124.54 and 72.18

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Solution

The fourth proportional to 83.12, 124.54 and 72.18 is: 108.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.12 : 124.54 = 72.18 : x
  2. Step 2: Convert to fraction form
    83.12/124.54 = 72.18/x
  3. Step 3: Cross multiply
    83.12x = 124.54 × 72.18
  4. Step 4: Simplify right side
    83.12x = 8,989.12
  5. Step 5: Solve for x
    x = 8,989.12/83.12
  6. Step 6: Final answer
    x = 108.15

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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.