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Finding the Fourth Proportional to 179.87, 269.79 and 77.10

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Solution

The fourth proportional to 179.87, 269.79 and 77.10 is: 115.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.87 : 269.79 = 77.10 : x
  2. Step 2: Convert to fraction form
    179.87/269.79 = 77.10/x
  3. Step 3: Cross multiply
    179.87x = 269.79 × 77.10
  4. Step 4: Simplify right side
    179.87x = 20,800.81
  5. Step 5: Solve for x
    x = 20,800.81/179.87
  6. Step 6: Final answer
    x = 115.64

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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.