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Finding the Fourth Proportional to 157.91, 217.90 and 87.96

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Solution

The fourth proportional to 157.91, 217.90 and 87.96 is: 121.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.91 : 217.90 = 87.96 : x
  2. Step 2: Convert to fraction form
    157.91/217.90 = 87.96/x
  3. Step 3: Cross multiply
    157.91x = 217.90 × 87.96
  4. Step 4: Simplify right side
    157.91x = 19,165.69
  5. Step 5: Solve for x
    x = 19,165.69/157.91
  6. Step 6: Final answer
    x = 121.37

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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.