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Finding the Fourth Proportional to 88.89, 121.87 and 87.27

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Solution

The fourth proportional to 88.89, 121.87 and 87.27 is: 119.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.89 : 121.87 = 87.27 : x
  2. Step 2: Convert to fraction form
    88.89/121.87 = 87.27/x
  3. Step 3: Cross multiply
    88.89x = 121.87 × 87.27
  4. Step 4: Simplify right side
    88.89x = 10,635.38
  5. Step 5: Solve for x
    x = 10,635.38/88.89
  6. Step 6: Final answer
    x = 119.65

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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.