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Finding the Fourth Proportional to 139.54, 209.28 and 88.12

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Solution

The fourth proportional to 139.54, 209.28 and 88.12 is: 132.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.54 : 209.28 = 88.12 : x
  2. Step 2: Convert to fraction form
    139.54/209.28 = 88.12/x
  3. Step 3: Cross multiply
    139.54x = 209.28 × 88.12
  4. Step 4: Simplify right side
    139.54x = 18,441.75
  5. Step 5: Solve for x
    x = 18,441.75/139.54
  6. Step 6: Final answer
    x = 132.16

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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.