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Finding the Fourth Proportional to 83.15, 124.39 and 71.86

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Solution

The fourth proportional to 83.15, 124.39 and 71.86 is: 107.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.15 : 124.39 = 71.86 : x
  2. Step 2: Convert to fraction form
    83.15/124.39 = 71.86/x
  3. Step 3: Cross multiply
    83.15x = 124.39 × 71.86
  4. Step 4: Simplify right side
    83.15x = 8,938.67
  5. Step 5: Solve for x
    x = 8,938.67/83.15
  6. Step 6: Final answer
    x = 107.50

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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.