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Finding the Fourth Proportional to 42.14, 63.16 and 21.87

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Solution

The fourth proportional to 42.14, 63.16 and 21.87 is: 32.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.14 : 63.16 = 21.87 : x
  2. Step 2: Convert to fraction form
    42.14/63.16 = 21.87/x
  3. Step 3: Cross multiply
    42.14x = 63.16 × 21.87
  4. Step 4: Simplify right side
    42.14x = 1,381.31
  5. Step 5: Solve for x
    x = 1,381.31/42.14
  6. Step 6: Final answer
    x = 32.78

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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.