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Finding the Fourth Proportional to 256.96, 385.45 and 196.46

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Solution

The fourth proportional to 256.96, 385.45 and 196.46 is: 294.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.96 : 385.45 = 196.46 : x
  2. Step 2: Convert to fraction form
    256.96/385.45 = 196.46/x
  3. Step 3: Cross multiply
    256.96x = 385.45 × 196.46
  4. Step 4: Simplify right side
    256.96x = 75,725.51
  5. Step 5: Solve for x
    x = 75,725.51/256.96
  6. Step 6: Final answer
    x = 294.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.