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Finding the Fourth Proportional to 256.27, 384.37 and 85.27

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Solution

The fourth proportional to 256.27, 384.37 and 85.27 is: 127.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.27 : 384.37 = 85.27 : x
  2. Step 2: Convert to fraction form
    256.27/384.37 = 85.27/x
  3. Step 3: Cross multiply
    256.27x = 384.37 × 85.27
  4. Step 4: Simplify right side
    256.27x = 32,774.80
  5. Step 5: Solve for x
    x = 32,774.80/256.27
  6. Step 6: Final answer
    x = 127.89

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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.