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Finding the Fourth Proportional to 261.77, 360.65 and 212.56

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Solution

The fourth proportional to 261.77, 360.65 and 212.56 is: 292.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.77 : 360.65 = 212.56 : x
  2. Step 2: Convert to fraction form
    261.77/360.65 = 212.56/x
  3. Step 3: Cross multiply
    261.77x = 360.65 × 212.56
  4. Step 4: Simplify right side
    261.77x = 76,659.39
  5. Step 5: Solve for x
    x = 76,659.39/261.77
  6. Step 6: Final answer
    x = 292.86

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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.