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Finding the Fourth Proportional to 44.75, 67.09 and 20.72

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Solution

The fourth proportional to 44.75, 67.09 and 20.72 is: 31.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    44.75 : 67.09 = 20.72 : x
  2. Step 2: Convert to fraction form
    44.75/67.09 = 20.72/x
  3. Step 3: Cross multiply
    44.75x = 67.09 × 20.72
  4. Step 4: Simplify right side
    44.75x = 1,390.10
  5. Step 5: Solve for x
    x = 1,390.10/44.75
  6. Step 6: Final answer
    x = 31.06

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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.