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Finding the Fourth Proportional to 311.32, 466.26 and 215.20

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Solution

The fourth proportional to 311.32, 466.26 and 215.20 is: 322.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.32 : 466.26 = 215.20 : x
  2. Step 2: Convert to fraction form
    311.32/466.26 = 215.20/x
  3. Step 3: Cross multiply
    311.32x = 466.26 × 215.20
  4. Step 4: Simplify right side
    311.32x = 100,339.15
  5. Step 5: Solve for x
    x = 100,339.15/311.32
  6. Step 6: Final answer
    x = 322.30

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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.