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Finding the Fourth Proportional to 179.64, 269.24 and 76.86

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Solution

The fourth proportional to 179.64, 269.24 and 76.86 is: 115.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.64 : 269.24 = 76.86 : x
  2. Step 2: Convert to fraction form
    179.64/269.24 = 76.86/x
  3. Step 3: Cross multiply
    179.64x = 269.24 × 76.86
  4. Step 4: Simplify right side
    179.64x = 20,693.40
  5. Step 5: Solve for x
    x = 20,693.40/179.64
  6. Step 6: Final answer
    x = 115.19

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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.