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Finding the Fourth Proportional to 1,380.92, 2,072.18 and 515.20

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Solution

The fourth proportional to 1,380.92, 2,072.18 and 515.20 is: 773.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.92 : 2,072.18 = 515.20 : x
  2. Step 2: Convert to fraction form
    1,380.92/2,072.18 = 515.20/x
  3. Step 3: Cross multiply
    1,380.92x = 2,072.18 × 515.20
  4. Step 4: Simplify right side
    1,380.92x = 1,067,587.14
  5. Step 5: Solve for x
    x = 1,067,587.14/1,380.92
  6. Step 6: Final answer
    x = 773.10

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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.