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Finding the Fourth Proportional to 157.43, 217.28 and 99.29

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Solution

The fourth proportional to 157.43, 217.28 and 99.29 is: 137.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.43 : 217.28 = 99.29 : x
  2. Step 2: Convert to fraction form
    157.43/217.28 = 99.29/x
  3. Step 3: Cross multiply
    157.43x = 217.28 × 99.29
  4. Step 4: Simplify right side
    157.43x = 21,573.73
  5. Step 5: Solve for x
    x = 21,573.73/157.43
  6. Step 6: Final answer
    x = 137.04

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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.