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Finding the Fourth Proportional to 37.87, 52.20 and 28.15

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Solution

The fourth proportional to 37.87, 52.20 and 28.15 is: 38.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.87 : 52.20 = 28.15 : x
  2. Step 2: Convert to fraction form
    37.87/52.20 = 28.15/x
  3. Step 3: Cross multiply
    37.87x = 52.20 × 28.15
  4. Step 4: Simplify right side
    37.87x = 1,469.43
  5. Step 5: Solve for x
    x = 1,469.43/37.87
  6. Step 6: Final answer
    x = 38.80

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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.