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Finding the Fourth Proportional to 261.32, 360.92 and 212.72

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Solution

The fourth proportional to 261.32, 360.92 and 212.72 is: 293.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.32 : 360.92 = 212.72 : x
  2. Step 2: Convert to fraction form
    261.32/360.92 = 212.72/x
  3. Step 3: Cross multiply
    261.32x = 360.92 × 212.72
  4. Step 4: Simplify right side
    261.32x = 76,774.90
  5. Step 5: Solve for x
    x = 76,774.90/261.32
  6. Step 6: Final answer
    x = 293.80

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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.