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Finding the Fourth Proportional to 157.26, 217.03 and 91.78

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Solution

The fourth proportional to 157.26, 217.03 and 91.78 is: 126.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.26 : 217.03 = 91.78 : x
  2. Step 2: Convert to fraction form
    157.26/217.03 = 91.78/x
  3. Step 3: Cross multiply
    157.26x = 217.03 × 91.78
  4. Step 4: Simplify right side
    157.26x = 19,918.61
  5. Step 5: Solve for x
    x = 19,918.61/157.26
  6. Step 6: Final answer
    x = 126.66

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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.