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Finding the Fourth Proportional to 83.15, 124.68 and 71.46

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Solution

The fourth proportional to 83.15, 124.68 and 71.46 is: 107.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.15 : 124.68 = 71.46 : x
  2. Step 2: Convert to fraction form
    83.15/124.68 = 71.46/x
  3. Step 3: Cross multiply
    83.15x = 124.68 × 71.46
  4. Step 4: Simplify right side
    83.15x = 8,909.90
  5. Step 5: Solve for x
    x = 8,909.90/83.15
  6. Step 6: Final answer
    x = 107.16

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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.