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Finding the Fourth Proportional to 74.80, 112.24 and 42.76

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Solution

The fourth proportional to 74.80, 112.24 and 42.76 is: 64.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.80 : 112.24 = 42.76 : x
  2. Step 2: Convert to fraction form
    74.80/112.24 = 42.76/x
  3. Step 3: Cross multiply
    74.80x = 112.24 × 42.76
  4. Step 4: Simplify right side
    74.80x = 4,799.38
  5. Step 5: Solve for x
    x = 4,799.38/74.80
  6. Step 6: Final answer
    x = 64.16

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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.