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Finding the Fourth Proportional to 256.72, 354.10 and 194.79

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Solution

The fourth proportional to 256.72, 354.10 and 194.79 is: 268.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.72 : 354.10 = 194.79 : x
  2. Step 2: Convert to fraction form
    256.72/354.10 = 194.79/x
  3. Step 3: Cross multiply
    256.72x = 354.10 × 194.79
  4. Step 4: Simplify right side
    256.72x = 68,975.14
  5. Step 5: Solve for x
    x = 68,975.14/256.72
  6. Step 6: Final answer
    x = 268.68

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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.