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Finding the Fourth Proportional to 256.67, 385.07 and 134.90

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Solution

The fourth proportional to 256.67, 385.07 and 134.90 is: 202.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.67 : 385.07 = 134.90 : x
  2. Step 2: Convert to fraction form
    256.67/385.07 = 134.90/x
  3. Step 3: Cross multiply
    256.67x = 385.07 × 134.90
  4. Step 4: Simplify right side
    256.67x = 51,945.94
  5. Step 5: Solve for x
    x = 51,945.94/256.67
  6. Step 6: Final answer
    x = 202.38

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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.