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Finding the Fourth Proportional to 83.46, 124.32 and 78.78

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Solution

The fourth proportional to 83.46, 124.32 and 78.78 is: 117.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.46 : 124.32 = 78.78 : x
  2. Step 2: Convert to fraction form
    83.46/124.32 = 78.78/x
  3. Step 3: Cross multiply
    83.46x = 124.32 × 78.78
  4. Step 4: Simplify right side
    83.46x = 9,793.93
  5. Step 5: Solve for x
    x = 9,793.93/83.46
  6. Step 6: Final answer
    x = 117.35

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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.