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Finding the Fourth Proportional to 79.26, 118.82 and 38.72

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Solution

The fourth proportional to 79.26, 118.82 and 38.72 is: 58.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.26 : 118.82 = 38.72 : x
  2. Step 2: Convert to fraction form
    79.26/118.82 = 38.72/x
  3. Step 3: Cross multiply
    79.26x = 118.82 × 38.72
  4. Step 4: Simplify right side
    79.26x = 4,600.71
  5. Step 5: Solve for x
    x = 4,600.71/79.26
  6. Step 6: Final answer
    x = 58.05

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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.