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Finding the Fourth Proportional to 1,249.78, 1,872.99 and 479.86

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Solution

The fourth proportional to 1,249.78, 1,872.99 and 479.86 is: 719.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.78 : 1,872.99 = 479.86 : x
  2. Step 2: Convert to fraction form
    1,249.78/1,872.99 = 479.86/x
  3. Step 3: Cross multiply
    1,249.78x = 1,872.99 × 479.86
  4. Step 4: Simplify right side
    1,249.78x = 898,772.98
  5. Step 5: Solve for x
    x = 898,772.98/1,249.78
  6. Step 6: Final answer
    x = 719.14

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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.