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Finding the Fourth Proportional to 79.31, 118.43 and 74.15

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Solution

The fourth proportional to 79.31, 118.43 and 74.15 is: 110.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.31 : 118.43 = 74.15 : x
  2. Step 2: Convert to fraction form
    79.31/118.43 = 74.15/x
  3. Step 3: Cross multiply
    79.31x = 118.43 × 74.15
  4. Step 4: Simplify right side
    79.31x = 8,781.34
  5. Step 5: Solve for x
    x = 8,781.34/79.31
  6. Step 6: Final answer
    x = 110.72

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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.