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Finding the Fourth Proportional to 311.24, 466.16 and 213.20

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Solution

The fourth proportional to 311.24, 466.16 and 213.20 is: 319.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.24 : 466.16 = 213.20 : x
  2. Step 2: Convert to fraction form
    311.24/466.16 = 213.20/x
  3. Step 3: Cross multiply
    311.24x = 466.16 × 213.20
  4. Step 4: Simplify right side
    311.24x = 99,385.31
  5. Step 5: Solve for x
    x = 99,385.31/311.24
  6. Step 6: Final answer
    x = 319.32

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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.