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Finding the Fourth Proportional to 79.15, 118.68 and 38.55

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Solution

The fourth proportional to 79.15, 118.68 and 38.55 is: 57.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.15 : 118.68 = 38.55 : x
  2. Step 2: Convert to fraction form
    79.15/118.68 = 38.55/x
  3. Step 3: Cross multiply
    79.15x = 118.68 × 38.55
  4. Step 4: Simplify right side
    79.15x = 4,575.11
  5. Step 5: Solve for x
    x = 4,575.11/79.15
  6. Step 6: Final answer
    x = 57.80

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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.