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Finding the Fourth Proportional to 1,249.61, 1,874.90 and 519

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Solution

The fourth proportional to 1,249.61, 1,874.90 and 519 is: 778.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.61 : 1,874.90 = 519 : x
  2. Step 2: Convert to fraction form
    1,249.61/1,874.90 = 519/x
  3. Step 3: Cross multiply
    1,249.61x = 1,874.90 × 519
  4. Step 4: Simplify right side
    1,249.61x = 973,073.10
  5. Step 5: Solve for x
    x = 973,073.10/1,249.61
  6. Step 6: Final answer
    x = 778.70

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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.