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Finding the Fourth Proportional to 1,939.39, 2,909.03 and 478.55

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Solution

The fourth proportional to 1,939.39, 2,909.03 and 478.55 is: 717.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.39 : 2,909.03 = 478.55 : x
  2. Step 2: Convert to fraction form
    1,939.39/2,909.03 = 478.55/x
  3. Step 3: Cross multiply
    1,939.39x = 2,909.03 × 478.55
  4. Step 4: Simplify right side
    1,939.39x = 1,392,113.91
  5. Step 5: Solve for x
    x = 1,392,113.91/1,939.39
  6. Step 6: Final answer
    x = 717.81

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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.