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Finding the Fourth Proportional to 256.88, 385.68 and 133.60

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Solution

The fourth proportional to 256.88, 385.68 and 133.60 is: 200.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.88 : 385.68 = 133.60 : x
  2. Step 2: Convert to fraction form
    256.88/385.68 = 133.60/x
  3. Step 3: Cross multiply
    256.88x = 385.68 × 133.60
  4. Step 4: Simplify right side
    256.88x = 51,526.85
  5. Step 5: Solve for x
    x = 51,526.85/256.88
  6. Step 6: Final answer
    x = 200.59

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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.