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Finding the Fourth Proportional to 261.28, 360.61 and 161.73

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Solution

The fourth proportional to 261.28, 360.61 and 161.73 is: 223.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.28 : 360.61 = 161.73 : x
  2. Step 2: Convert to fraction form
    261.28/360.61 = 161.73/x
  3. Step 3: Cross multiply
    261.28x = 360.61 × 161.73
  4. Step 4: Simplify right side
    261.28x = 58,321.01
  5. Step 5: Solve for x
    x = 58,321.01/261.28
  6. Step 6: Final answer
    x = 223.21

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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.