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Finding the Fourth Proportional to 79.39, 118.99 and 45.18

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Solution

The fourth proportional to 79.39, 118.99 and 45.18 is: 67.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.39 : 118.99 = 45.18 : x
  2. Step 2: Convert to fraction form
    79.39/118.99 = 45.18/x
  3. Step 3: Cross multiply
    79.39x = 118.99 × 45.18
  4. Step 4: Simplify right side
    79.39x = 5,375.97
  5. Step 5: Solve for x
    x = 5,375.97/79.39
  6. Step 6: Final answer
    x = 67.72

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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.