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Finding the Fourth Proportional to 256.28, 384.56 and 255.47

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Solution

The fourth proportional to 256.28, 384.56 and 255.47 is: 383.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.28 : 384.56 = 255.47 : x
  2. Step 2: Convert to fraction form
    256.28/384.56 = 255.47/x
  3. Step 3: Cross multiply
    256.28x = 384.56 × 255.47
  4. Step 4: Simplify right side
    256.28x = 98,242.27
  5. Step 5: Solve for x
    x = 98,242.27/256.28
  6. Step 6: Final answer
    x = 383.34

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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.