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Finding the Fourth Proportional to 83.85, 124.90 and 79.19

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Solution

The fourth proportional to 83.85, 124.90 and 79.19 is: 117.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.85 : 124.90 = 79.19 : x
  2. Step 2: Convert to fraction form
    83.85/124.90 = 79.19/x
  3. Step 3: Cross multiply
    83.85x = 124.90 × 79.19
  4. Step 4: Simplify right side
    83.85x = 9,890.48
  5. Step 5: Solve for x
    x = 9,890.48/83.85
  6. Step 6: Final answer
    x = 117.96

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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.