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Finding the Fourth Proportional to 79.34, 118.90 and 74.78

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Solution

The fourth proportional to 79.34, 118.90 and 74.78 is: 112.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.34 : 118.90 = 74.78 : x
  2. Step 2: Convert to fraction form
    79.34/118.90 = 74.78/x
  3. Step 3: Cross multiply
    79.34x = 118.90 × 74.78
  4. Step 4: Simplify right side
    79.34x = 8,891.34
  5. Step 5: Solve for x
    x = 8,891.34/79.34
  6. Step 6: Final answer
    x = 112.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.