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Finding the Fourth Proportional to 83.66, 124.59 and 78.47

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Solution

The fourth proportional to 83.66, 124.59 and 78.47 is: 116.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.66 : 124.59 = 78.47 : x
  2. Step 2: Convert to fraction form
    83.66/124.59 = 78.47/x
  3. Step 3: Cross multiply
    83.66x = 124.59 × 78.47
  4. Step 4: Simplify right side
    83.66x = 9,776.18
  5. Step 5: Solve for x
    x = 9,776.18/83.66
  6. Step 6: Final answer
    x = 116.86

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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.