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Finding the Fourth Proportional to 79.12, 118.71 and 38.53

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Solution

The fourth proportional to 79.12, 118.71 and 38.53 is: 57.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.12 : 118.71 = 38.53 : x
  2. Step 2: Convert to fraction form
    79.12/118.71 = 38.53/x
  3. Step 3: Cross multiply
    79.12x = 118.71 × 38.53
  4. Step 4: Simplify right side
    79.12x = 4,573.90
  5. Step 5: Solve for x
    x = 4,573.90/79.12
  6. Step 6: Final answer
    x = 57.81

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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.