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Finding the Fourth Proportional to 256.37, 384.44 and 85.25

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Solution

The fourth proportional to 256.37, 384.44 and 85.25 is: 127.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.37 : 384.44 = 85.25 : x
  2. Step 2: Convert to fraction form
    256.37/384.44 = 85.25/x
  3. Step 3: Cross multiply
    256.37x = 384.44 × 85.25
  4. Step 4: Simplify right side
    256.37x = 32,773.08
  5. Step 5: Solve for x
    x = 32,773.08/256.37
  6. Step 6: Final answer
    x = 127.84

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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.