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Finding the Fourth Proportional to 256.96, 354.81 and 195.40

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Solution

The fourth proportional to 256.96, 354.81 and 195.40 is: 269.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.96 : 354.81 = 195.40 : x
  2. Step 2: Convert to fraction form
    256.96/354.81 = 195.40/x
  3. Step 3: Cross multiply
    256.96x = 354.81 × 195.40
  4. Step 4: Simplify right side
    256.96x = 69,329.87
  5. Step 5: Solve for x
    x = 69,329.87/256.96
  6. Step 6: Final answer
    x = 269.81

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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.