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Finding the Fourth Proportional to 42.62, 63.91 and 19.79

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Solution

The fourth proportional to 42.62, 63.91 and 19.79 is: 29.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.62 : 63.91 = 19.79 : x
  2. Step 2: Convert to fraction form
    42.62/63.91 = 19.79/x
  3. Step 3: Cross multiply
    42.62x = 63.91 × 19.79
  4. Step 4: Simplify right side
    42.62x = 1,264.89
  5. Step 5: Solve for x
    x = 1,264.89/42.62
  6. Step 6: Final answer
    x = 29.68

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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.