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Finding the Fourth Proportional to 157.65, 217.49 and 113.91

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Solution

The fourth proportional to 157.65, 217.49 and 113.91 is: 157.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.65 : 217.49 = 113.91 : x
  2. Step 2: Convert to fraction form
    157.65/217.49 = 113.91/x
  3. Step 3: Cross multiply
    157.65x = 217.49 × 113.91
  4. Step 4: Simplify right side
    157.65x = 24,772.90
  5. Step 5: Solve for x
    x = 24,772.90/157.65
  6. Step 6: Final answer
    x = 157.14

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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.