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Finding the Fourth Proportional to 157.66, 217.82 and 127.86

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Solution

The fourth proportional to 157.66, 217.82 and 127.86 is: 176.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.66 : 217.82 = 127.86 : x
  2. Step 2: Convert to fraction form
    157.66/217.82 = 127.86/x
  3. Step 3: Cross multiply
    157.66x = 217.82 × 127.86
  4. Step 4: Simplify right side
    157.66x = 27,850.47
  5. Step 5: Solve for x
    x = 27,850.47/157.66
  6. Step 6: Final answer
    x = 176.65

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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.