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Finding the Fourth Proportional to 261, 360.18 and 161.40

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Solution

The fourth proportional to 261, 360.18 and 161.40 is: 222.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    261 : 360.18 = 161.40 : x
  2. Step 2: Convert to fraction form
    261/360.18 = 161.40/x
  3. Step 3: Cross multiply
    261x = 360.18 × 161.40
  4. Step 4: Simplify right side
    261x = 58,133.05
  5. Step 5: Solve for x
    x = 58,133.05/261
  6. Step 6: Final answer
    x = 222.73

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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.