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Finding the Fourth Proportional to 88.09, 132.89 and 85.66

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Solution

The fourth proportional to 88.09, 132.89 and 85.66 is: 129.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.09 : 132.89 = 85.66 : x
  2. Step 2: Convert to fraction form
    88.09/132.89 = 85.66/x
  3. Step 3: Cross multiply
    88.09x = 132.89 × 85.66
  4. Step 4: Simplify right side
    88.09x = 11,383.36
  5. Step 5: Solve for x
    x = 11,383.36/88.09
  6. Step 6: Final answer
    x = 129.22

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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.