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Finding the Fourth Proportional to 74.76, 111.97 and 42.63

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Solution

The fourth proportional to 74.76, 111.97 and 42.63 is: 63.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.76 : 111.97 = 42.63 : x
  2. Step 2: Convert to fraction form
    74.76/111.97 = 42.63/x
  3. Step 3: Cross multiply
    74.76x = 111.97 × 42.63
  4. Step 4: Simplify right side
    74.76x = 4,773.28
  5. Step 5: Solve for x
    x = 4,773.28/74.76
  6. Step 6: Final answer
    x = 63.85

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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.