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Finding the Fourth Proportional to 311.64, 467.67 and 215.28

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Solution

The fourth proportional to 311.64, 467.67 and 215.28 is: 323.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.64 : 467.67 = 215.28 : x
  2. Step 2: Convert to fraction form
    311.64/467.67 = 215.28/x
  3. Step 3: Cross multiply
    311.64x = 467.67 × 215.28
  4. Step 4: Simplify right side
    311.64x = 100,680.00
  5. Step 5: Solve for x
    x = 100,680.00/311.64
  6. Step 6: Final answer
    x = 323.07

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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.