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Finding the Fourth Proportional to 440.38, 660.57 and 115.72

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Solution

The fourth proportional to 440.38, 660.57 and 115.72 is: 173.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.38 : 660.57 = 115.72 : x
  2. Step 2: Convert to fraction form
    440.38/660.57 = 115.72/x
  3. Step 3: Cross multiply
    440.38x = 660.57 × 115.72
  4. Step 4: Simplify right side
    440.38x = 76,441.16
  5. Step 5: Solve for x
    x = 76,441.16/440.38
  6. Step 6: Final answer
    x = 173.58

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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.