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Finding the Fourth Proportional to 83.69, 126.17 and 77.82

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Solution

The fourth proportional to 83.69, 126.17 and 77.82 is: 117.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.69 : 126.17 = 77.82 : x
  2. Step 2: Convert to fraction form
    83.69/126.17 = 77.82/x
  3. Step 3: Cross multiply
    83.69x = 126.17 × 77.82
  4. Step 4: Simplify right side
    83.69x = 9,817.98
  5. Step 5: Solve for x
    x = 9,817.98/83.69
  6. Step 6: Final answer
    x = 117.32

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.