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Finding the Fourth Proportional to 157.19, 216.92 and 91.73

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Solution

The fourth proportional to 157.19, 216.92 and 91.73 is: 126.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.19 : 216.92 = 91.73 : x
  2. Step 2: Convert to fraction form
    157.19/216.92 = 91.73/x
  3. Step 3: Cross multiply
    157.19x = 216.92 × 91.73
  4. Step 4: Simplify right side
    157.19x = 19,898.07
  5. Step 5: Solve for x
    x = 19,898.07/157.19
  6. Step 6: Final answer
    x = 126.59

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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.