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Finding the Fourth Proportional to 256.95, 385.61 and 133.70

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Solution

The fourth proportional to 256.95, 385.61 and 133.70 is: 200.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.95 : 385.61 = 133.70 : x
  2. Step 2: Convert to fraction form
    256.95/385.61 = 133.70/x
  3. Step 3: Cross multiply
    256.95x = 385.61 × 133.70
  4. Step 4: Simplify right side
    256.95x = 51,553.46
  5. Step 5: Solve for x
    x = 51,553.46/256.95
  6. Step 6: Final answer
    x = 200.64

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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.