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Finding the Fourth Proportional to 261.25, 360.56 and 161.72

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Solution

The fourth proportional to 261.25, 360.56 and 161.72 is: 223.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.25 : 360.56 = 161.72 : x
  2. Step 2: Convert to fraction form
    261.25/360.56 = 161.72/x
  3. Step 3: Cross multiply
    261.25x = 360.56 × 161.72
  4. Step 4: Simplify right side
    261.25x = 58,309.76
  5. Step 5: Solve for x
    x = 58,309.76/261.25
  6. Step 6: Final answer
    x = 223.20

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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.