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Finding the Fourth Proportional to 74.57, 111.22 and 71.87

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Solution

The fourth proportional to 74.57, 111.22 and 71.87 is: 107.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.57 : 111.22 = 71.87 : x
  2. Step 2: Convert to fraction form
    74.57/111.22 = 71.87/x
  3. Step 3: Cross multiply
    74.57x = 111.22 × 71.87
  4. Step 4: Simplify right side
    74.57x = 7,993.38
  5. Step 5: Solve for x
    x = 7,993.38/74.57
  6. Step 6: Final answer
    x = 107.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.