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Finding the Fourth Proportional to 44.11, 66.13 and 21.28

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Solution

The fourth proportional to 44.11, 66.13 and 21.28 is: 31.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    44.11 : 66.13 = 21.28 : x
  2. Step 2: Convert to fraction form
    44.11/66.13 = 21.28/x
  3. Step 3: Cross multiply
    44.11x = 66.13 × 21.28
  4. Step 4: Simplify right side
    44.11x = 1,407.25
  5. Step 5: Solve for x
    x = 1,407.25/44.11
  6. Step 6: Final answer
    x = 31.90

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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.