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Finding the Fourth Proportional to 1,249.28, 1,872 and 479.36

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Solution

The fourth proportional to 1,249.28, 1,872 and 479.36 is: 718.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.28 : 1,872 = 479.36 : x
  2. Step 2: Convert to fraction form
    1,249.28/1,872 = 479.36/x
  3. Step 3: Cross multiply
    1,249.28x = 1,872 × 479.36
  4. Step 4: Simplify right side
    1,249.28x = 897,361.92
  5. Step 5: Solve for x
    x = 897,361.92/1,249.28
  6. Step 6: Final answer
    x = 718.30

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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.