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Finding the Fourth Proportional to 231.44, 318.96 and 157.76

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Solution

The fourth proportional to 231.44, 318.96 and 157.76 is: 217.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.44 : 318.96 = 157.76 : x
  2. Step 2: Convert to fraction form
    231.44/318.96 = 157.76/x
  3. Step 3: Cross multiply
    231.44x = 318.96 × 157.76
  4. Step 4: Simplify right side
    231.44x = 50,319.13
  5. Step 5: Solve for x
    x = 50,319.13/231.44
  6. Step 6: Final answer
    x = 217.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.