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Finding the Fourth Proportional to 256.80, 384.80 and 112.48

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Solution

The fourth proportional to 256.80, 384.80 and 112.48 is: 168.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.80 : 384.80 = 112.48 : x
  2. Step 2: Convert to fraction form
    256.80/384.80 = 112.48/x
  3. Step 3: Cross multiply
    256.80x = 384.80 × 112.48
  4. Step 4: Simplify right side
    256.80x = 43,282.30
  5. Step 5: Solve for x
    x = 43,282.30/256.80
  6. Step 6: Final answer
    x = 168.54

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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.