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Finding the Fourth Proportional to 256.72, 354.42 and 179.20

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Solution

The fourth proportional to 256.72, 354.42 and 179.20 is: 247.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.72 : 354.42 = 179.20 : x
  2. Step 2: Convert to fraction form
    256.72/354.42 = 179.20/x
  3. Step 3: Cross multiply
    256.72x = 354.42 × 179.20
  4. Step 4: Simplify right side
    256.72x = 63,512.06
  5. Step 5: Solve for x
    x = 63,512.06/256.72
  6. Step 6: Final answer
    x = 247.40

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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.