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Finding the Fourth Proportional to 1,249.30, 1,874.78 and 518.87

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Solution

The fourth proportional to 1,249.30, 1,874.78 and 518.87 is: 778.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.30 : 1,874.78 = 518.87 : x
  2. Step 2: Convert to fraction form
    1,249.30/1,874.78 = 518.87/x
  3. Step 3: Cross multiply
    1,249.30x = 1,874.78 × 518.87
  4. Step 4: Simplify right side
    1,249.30x = 972,769.19
  5. Step 5: Solve for x
    x = 972,769.19/1,249.30
  6. Step 6: Final answer
    x = 778.65

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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.