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Finding the Fourth Proportional to 42.28, 63.37 and 21.97

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Solution

The fourth proportional to 42.28, 63.37 and 21.97 is: 32.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.28 : 63.37 = 21.97 : x
  2. Step 2: Convert to fraction form
    42.28/63.37 = 21.97/x
  3. Step 3: Cross multiply
    42.28x = 63.37 × 21.97
  4. Step 4: Simplify right side
    42.28x = 1,392.24
  5. Step 5: Solve for x
    x = 1,392.24/42.28
  6. Step 6: Final answer
    x = 32.93

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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.