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Finding the Fourth Proportional to 74.85, 112.31 and 29.21

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Solution

The fourth proportional to 74.85, 112.31 and 29.21 is: 43.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.85 : 112.31 = 29.21 : x
  2. Step 2: Convert to fraction form
    74.85/112.31 = 29.21/x
  3. Step 3: Cross multiply
    74.85x = 112.31 × 29.21
  4. Step 4: Simplify right side
    74.85x = 3,280.09
  5. Step 5: Solve for x
    x = 3,280.09/74.85
  6. Step 6: Final answer
    x = 43.82

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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.