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Finding the Fourth Proportional to 44.61, 66.90 and 20.55

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Solution

The fourth proportional to 44.61, 66.90 and 20.55 is: 30.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    44.61 : 66.90 = 20.55 : x
  2. Step 2: Convert to fraction form
    44.61/66.90 = 20.55/x
  3. Step 3: Cross multiply
    44.61x = 66.90 × 20.55
  4. Step 4: Simplify right side
    44.61x = 1,374.80
  5. Step 5: Solve for x
    x = 1,374.80/44.61
  6. Step 6: Final answer
    x = 30.82

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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.