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Finding the Fourth Proportional to 74.85, 112.17 and 71.25

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Solution

The fourth proportional to 74.85, 112.17 and 71.25 is: 106.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.85 : 112.17 = 71.25 : x
  2. Step 2: Convert to fraction form
    74.85/112.17 = 71.25/x
  3. Step 3: Cross multiply
    74.85x = 112.17 × 71.25
  4. Step 4: Simplify right side
    74.85x = 7,992.11
  5. Step 5: Solve for x
    x = 7,992.11/74.85
  6. Step 6: Final answer
    x = 106.78

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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.