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Finding the Fourth Proportional to 38.62, 53.21 and 29.87

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Solution

The fourth proportional to 38.62, 53.21 and 29.87 is: 41.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.62 : 53.21 = 29.87 : x
  2. Step 2: Convert to fraction form
    38.62/53.21 = 29.87/x
  3. Step 3: Cross multiply
    38.62x = 53.21 × 29.87
  4. Step 4: Simplify right side
    38.62x = 1,589.38
  5. Step 5: Solve for x
    x = 1,589.38/38.62
  6. Step 6: Final answer
    x = 41.15

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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.