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Finding the Fourth Proportional to 88.16, 132.31 and 72.09

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Solution

The fourth proportional to 88.16, 132.31 and 72.09 is: 108.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.16 : 132.31 = 72.09 : x
  2. Step 2: Convert to fraction form
    88.16/132.31 = 72.09/x
  3. Step 3: Cross multiply
    88.16x = 132.31 × 72.09
  4. Step 4: Simplify right side
    88.16x = 9,538.05
  5. Step 5: Solve for x
    x = 9,538.05/88.16
  6. Step 6: Final answer
    x = 108.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.