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Finding the Fourth Proportional to 88.75, 121.85 and 74.87

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Solution

The fourth proportional to 88.75, 121.85 and 74.87 is: 102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.75 : 121.85 = 74.87 : x
  2. Step 2: Convert to fraction form
    88.75/121.85 = 74.87/x
  3. Step 3: Cross multiply
    88.75x = 121.85 × 74.87
  4. Step 4: Simplify right side
    88.75x = 9,123.77
  5. Step 5: Solve for x
    x = 9,123.77/88.75
  6. Step 6: Final answer
    x = 102.81

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.