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Finding the Fourth Proportional to 1,249.65, 1,874.57 and 519.12

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Solution

The fourth proportional to 1,249.65, 1,874.57 and 519.12 is: 778.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.65 : 1,874.57 = 519.12 : x
  2. Step 2: Convert to fraction form
    1,249.65/1,874.57 = 519.12/x
  3. Step 3: Cross multiply
    1,249.65x = 1,874.57 × 519.12
  4. Step 4: Simplify right side
    1,249.65x = 973,124.18
  5. Step 5: Solve for x
    x = 973,124.18/1,249.65
  6. Step 6: Final answer
    x = 778.72

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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.