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Finding the Fourth Proportional to 311.76, 467.68 and 157.76

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Solution

The fourth proportional to 311.76, 467.68 and 157.76 is: 236.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.76 : 467.68 = 157.76 : x
  2. Step 2: Convert to fraction form
    311.76/467.68 = 157.76/x
  3. Step 3: Cross multiply
    311.76x = 467.68 × 157.76
  4. Step 4: Simplify right side
    311.76x = 73,781.20
  5. Step 5: Solve for x
    x = 73,781.20/311.76
  6. Step 6: Final answer
    x = 236.66

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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.