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Finding the Fourth Proportional to 261.34, 360.65 and 161.80

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Solution

The fourth proportional to 261.34, 360.65 and 161.80 is: 223.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.34 : 360.65 = 161.80 : x
  2. Step 2: Convert to fraction form
    261.34/360.65 = 161.80/x
  3. Step 3: Cross multiply
    261.34x = 360.65 × 161.80
  4. Step 4: Simplify right side
    261.34x = 58,352.67
  5. Step 5: Solve for x
    x = 58,352.67/261.34
  6. Step 6: Final answer
    x = 223.28

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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.