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Finding the Fourth Proportional to 318.60, 475.38 and 311.22

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Solution

The fourth proportional to 318.60, 475.38 and 311.22 is: 464.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.60 : 475.38 = 311.22 : x
  2. Step 2: Convert to fraction form
    318.60/475.38 = 311.22/x
  3. Step 3: Cross multiply
    318.60x = 475.38 × 311.22
  4. Step 4: Simplify right side
    318.60x = 147,947.76
  5. Step 5: Solve for x
    x = 147,947.76/318.60
  6. Step 6: Final answer
    x = 464.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.