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Finding the Fourth Proportional to 79.71, 118.92 and 77.10

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Solution

The fourth proportional to 79.71, 118.92 and 77.10 is: 115.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.71 : 118.92 = 77.10 : x
  2. Step 2: Convert to fraction form
    79.71/118.92 = 77.10/x
  3. Step 3: Cross multiply
    79.71x = 118.92 × 77.10
  4. Step 4: Simplify right side
    79.71x = 9,168.73
  5. Step 5: Solve for x
    x = 9,168.73/79.71
  6. Step 6: Final answer
    x = 115.03

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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.