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Finding the Fourth Proportional to 376.28, 518.80 and 287.87

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Solution

The fourth proportional to 376.28, 518.80 and 287.87 is: 396.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    376.28 : 518.80 = 287.87 : x
  2. Step 2: Convert to fraction form
    376.28/518.80 = 287.87/x
  3. Step 3: Cross multiply
    376.28x = 518.80 × 287.87
  4. Step 4: Simplify right side
    376.28x = 149,348.61
  5. Step 5: Solve for x
    x = 149,348.61/376.28
  6. Step 6: Final answer
    x = 396.91

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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.