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Finding the Fourth Proportional to 42.15, 58.20 and 38.04

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Solution

The fourth proportional to 42.15, 58.20 and 38.04 is: 52.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.15 : 58.20 = 38.04 : x
  2. Step 2: Convert to fraction form
    42.15/58.20 = 38.04/x
  3. Step 3: Cross multiply
    42.15x = 58.20 × 38.04
  4. Step 4: Simplify right side
    42.15x = 2,213.93
  5. Step 5: Solve for x
    x = 2,213.93/42.15
  6. Step 6: Final answer
    x = 52.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.