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Finding the Fourth Proportional to 88.61, 132.12 and 86.54

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Solution

The fourth proportional to 88.61, 132.12 and 86.54 is: 129.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.61 : 132.12 = 86.54 : x
  2. Step 2: Convert to fraction form
    88.61/132.12 = 86.54/x
  3. Step 3: Cross multiply
    88.61x = 132.12 × 86.54
  4. Step 4: Simplify right side
    88.61x = 11,433.00
  5. Step 5: Solve for x
    x = 11,433.00/88.61
  6. Step 6: Final answer
    x = 129.03

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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.