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Finding the Fourth Proportional to 256.15, 352.85 and 203.68

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Solution

The fourth proportional to 256.15, 352.85 and 203.68 is: 280.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.15 : 352.85 = 203.68 : x
  2. Step 2: Convert to fraction form
    256.15/352.85 = 203.68/x
  3. Step 3: Cross multiply
    256.15x = 352.85 × 203.68
  4. Step 4: Simplify right side
    256.15x = 71,868.12
  5. Step 5: Solve for x
    x = 71,868.12/256.15
  6. Step 6: Final answer
    x = 280.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.