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Finding the Fourth Proportional to 261.29, 360.66 and 161.79

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Solution

The fourth proportional to 261.29, 360.66 and 161.79 is: 223.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.29 : 360.66 = 161.79 : x
  2. Step 2: Convert to fraction form
    261.29/360.66 = 161.79/x
  3. Step 3: Cross multiply
    261.29x = 360.66 × 161.79
  4. Step 4: Simplify right side
    261.29x = 58,350.44
  5. Step 5: Solve for x
    x = 58,350.44/261.29
  6. Step 6: Final answer
    x = 223.31

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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.