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Finding the Fourth Proportional to 261.91, 360.61 and 212.95

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Solution

The fourth proportional to 261.91, 360.61 and 212.95 is: 293.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.91 : 360.61 = 212.95 : x
  2. Step 2: Convert to fraction form
    261.91/360.61 = 212.95/x
  3. Step 3: Cross multiply
    261.91x = 360.61 × 212.95
  4. Step 4: Simplify right side
    261.91x = 76,791.90
  5. Step 5: Solve for x
    x = 76,791.90/261.91
  6. Step 6: Final answer
    x = 293.20

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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.