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Finding the Fourth Proportional to 256.79, 354.35 and 140.36

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Solution

The fourth proportional to 256.79, 354.35 and 140.36 is: 193.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.79 : 354.35 = 140.36 : x
  2. Step 2: Convert to fraction form
    256.79/354.35 = 140.36/x
  3. Step 3: Cross multiply
    256.79x = 354.35 × 140.36
  4. Step 4: Simplify right side
    256.79x = 49,735.15
  5. Step 5: Solve for x
    x = 49,735.15/256.79
  6. Step 6: Final answer
    x = 193.68

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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.