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Finding the Fourth Proportional to 37.79, 52.15 and 21.41

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Solution

The fourth proportional to 37.79, 52.15 and 21.41 is: 29.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.79 : 52.15 = 21.41 : x
  2. Step 2: Convert to fraction form
    37.79/52.15 = 21.41/x
  3. Step 3: Cross multiply
    37.79x = 52.15 × 21.41
  4. Step 4: Simplify right side
    37.79x = 1,116.61
  5. Step 5: Solve for x
    x = 1,116.61/37.79
  6. Step 6: Final answer
    x = 29.55

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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.