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Finding the Fourth Proportional to 88.64, 132.12 and 86.20

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Solution

The fourth proportional to 88.64, 132.12 and 86.20 is: 128.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.64 : 132.12 = 86.20 : x
  2. Step 2: Convert to fraction form
    88.64/132.12 = 86.20/x
  3. Step 3: Cross multiply
    88.64x = 132.12 × 86.20
  4. Step 4: Simplify right side
    88.64x = 11,388.74
  5. Step 5: Solve for x
    x = 11,388.74/88.64
  6. Step 6: Final answer
    x = 128.48

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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.