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Finding the Fourth Proportional to 486.60, 671.34 and 276.78

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Solution

The fourth proportional to 486.60, 671.34 and 276.78 is: 381.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.60 : 671.34 = 276.78 : x
  2. Step 2: Convert to fraction form
    486.60/671.34 = 276.78/x
  3. Step 3: Cross multiply
    486.60x = 671.34 × 276.78
  4. Step 4: Simplify right side
    486.60x = 185,813.49
  5. Step 5: Solve for x
    x = 185,813.49/486.60
  6. Step 6: Final answer
    x = 381.86

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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.