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Finding the Fourth Proportional to 261.60, 360.72 and 211.92

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Solution

The fourth proportional to 261.60, 360.72 and 211.92 is: 292.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.60 : 360.72 = 211.92 : x
  2. Step 2: Convert to fraction form
    261.60/360.72 = 211.92/x
  3. Step 3: Cross multiply
    261.60x = 360.72 × 211.92
  4. Step 4: Simplify right side
    261.60x = 76,443.78
  5. Step 5: Solve for x
    x = 76,443.78/261.60
  6. Step 6: Final answer
    x = 292.22

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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.