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Finding the Fourth Proportional to 256.95, 354.69 and 194.78

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Solution

The fourth proportional to 256.95, 354.69 and 194.78 is: 268.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.95 : 354.69 = 194.78 : x
  2. Step 2: Convert to fraction form
    256.95/354.69 = 194.78/x
  3. Step 3: Cross multiply
    256.95x = 354.69 × 194.78
  4. Step 4: Simplify right side
    256.95x = 69,084.74
  5. Step 5: Solve for x
    x = 69,084.74/256.95
  6. Step 6: Final answer
    x = 268.86

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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.