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Finding the Fourth Proportional to 157.82, 217.61 and 136.91

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Solution

The fourth proportional to 157.82, 217.61 and 136.91 is: 188.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.82 : 217.61 = 136.91 : x
  2. Step 2: Convert to fraction form
    157.82/217.61 = 136.91/x
  3. Step 3: Cross multiply
    157.82x = 217.61 × 136.91
  4. Step 4: Simplify right side
    157.82x = 29,792.52
  5. Step 5: Solve for x
    x = 29,792.52/157.82
  6. Step 6: Final answer
    x = 188.78

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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.