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Finding the Fourth Proportional to 157.68, 217.61 and 92.21

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Solution

The fourth proportional to 157.68, 217.61 and 92.21 is: 127.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.68 : 217.61 = 92.21 : x
  2. Step 2: Convert to fraction form
    157.68/217.61 = 92.21/x
  3. Step 3: Cross multiply
    157.68x = 217.61 × 92.21
  4. Step 4: Simplify right side
    157.68x = 20,064.27
  5. Step 5: Solve for x
    x = 20,064.27/157.68
  6. Step 6: Final answer
    x = 127.25

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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.