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Finding the Fourth Proportional to 256.77, 385.02 and 220.86

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Solution

The fourth proportional to 256.77, 385.02 and 220.86 is: 331.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.77 : 385.02 = 220.86 : x
  2. Step 2: Convert to fraction form
    256.77/385.02 = 220.86/x
  3. Step 3: Cross multiply
    256.77x = 385.02 × 220.86
  4. Step 4: Simplify right side
    256.77x = 85,035.52
  5. Step 5: Solve for x
    x = 85,035.52/256.77
  6. Step 6: Final answer
    x = 331.17

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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.