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Finding the Fourth Proportional to 318.50, 440.64 and 311.56

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Solution

The fourth proportional to 318.50, 440.64 and 311.56 is: 431.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.50 : 440.64 = 311.56 : x
  2. Step 2: Convert to fraction form
    318.50/440.64 = 311.56/x
  3. Step 3: Cross multiply
    318.50x = 440.64 × 311.56
  4. Step 4: Simplify right side
    318.50x = 137,285.80
  5. Step 5: Solve for x
    x = 137,285.80/318.50
  6. Step 6: Final answer
    x = 431.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.