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Finding the Fourth Proportional to 74.85, 112.82 and 71.76

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Solution

The fourth proportional to 74.85, 112.82 and 71.76 is: 108.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.85 : 112.82 = 71.76 : x
  2. Step 2: Convert to fraction form
    74.85/112.82 = 71.76/x
  3. Step 3: Cross multiply
    74.85x = 112.82 × 71.76
  4. Step 4: Simplify right side
    74.85x = 8,096.14
  5. Step 5: Solve for x
    x = 8,096.14/74.85
  6. Step 6: Final answer
    x = 108.16

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.