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Finding the Fourth Proportional to 88.48, 121.56 and 85.09

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Solution

The fourth proportional to 88.48, 121.56 and 85.09 is: 116.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.48 : 121.56 = 85.09 : x
  2. Step 2: Convert to fraction form
    88.48/121.56 = 85.09/x
  3. Step 3: Cross multiply
    88.48x = 121.56 × 85.09
  4. Step 4: Simplify right side
    88.48x = 10,343.54
  5. Step 5: Solve for x
    x = 10,343.54/88.48
  6. Step 6: Final answer
    x = 116.90

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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.