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Finding the Fourth Proportional to 157.86, 217.82 and 91.47

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Solution

The fourth proportional to 157.86, 217.82 and 91.47 is: 126.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.86 : 217.82 = 91.47 : x
  2. Step 2: Convert to fraction form
    157.86/217.82 = 91.47/x
  3. Step 3: Cross multiply
    157.86x = 217.82 × 91.47
  4. Step 4: Simplify right side
    157.86x = 19,924.00
  5. Step 5: Solve for x
    x = 19,924.00/157.86
  6. Step 6: Final answer
    x = 126.21

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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.