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Finding the Fourth Proportional to 256.81, 353.79 and 212.37

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Solution

The fourth proportional to 256.81, 353.79 and 212.37 is: 292.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.81 : 353.79 = 212.37 : x
  2. Step 2: Convert to fraction form
    256.81/353.79 = 212.37/x
  3. Step 3: Cross multiply
    256.81x = 353.79 × 212.37
  4. Step 4: Simplify right side
    256.81x = 75,134.38
  5. Step 5: Solve for x
    x = 75,134.38/256.81
  6. Step 6: Final answer
    x = 292.57

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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.