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Finding the Fourth Proportional to 44.32, 66.38 and 42.20

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Solution

The fourth proportional to 44.32, 66.38 and 42.20 is: 63.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    44.32 : 66.38 = 42.20 : x
  2. Step 2: Convert to fraction form
    44.32/66.38 = 42.20/x
  3. Step 3: Cross multiply
    44.32x = 66.38 × 42.20
  4. Step 4: Simplify right side
    44.32x = 2,801.24
  5. Step 5: Solve for x
    x = 2,801.24/44.32
  6. Step 6: Final answer
    x = 63.20

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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.