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Finding the Fourth Proportional to 1,939.92, 2,909.87 and 479.08

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Solution

The fourth proportional to 1,939.92, 2,909.87 and 479.08 is: 718.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.92 : 2,909.87 = 479.08 : x
  2. Step 2: Convert to fraction form
    1,939.92/2,909.87 = 479.08/x
  3. Step 3: Cross multiply
    1,939.92x = 2,909.87 × 479.08
  4. Step 4: Simplify right side
    1,939.92x = 1,394,050.85
  5. Step 5: Solve for x
    x = 1,394,050.85/1,939.92
  6. Step 6: Final answer
    x = 718.61

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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.