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Finding the Fourth Proportional to 157.47, 217.17 and 102.21

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Solution

The fourth proportional to 157.47, 217.17 and 102.21 is: 140.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.47 : 217.17 = 102.21 : x
  2. Step 2: Convert to fraction form
    157.47/217.17 = 102.21/x
  3. Step 3: Cross multiply
    157.47x = 217.17 × 102.21
  4. Step 4: Simplify right side
    157.47x = 22,196.95
  5. Step 5: Solve for x
    x = 22,196.95/157.47
  6. Step 6: Final answer
    x = 140.96

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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.