Home / 1,939.42-2,909.09-478.57

Finding the Fourth Proportional to 1,939.42, 2,909.09 and 478.57

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Solution

The fourth proportional to 1,939.42, 2,909.09 and 478.57 is: 717.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.42 : 2,909.09 = 478.57 : x
  2. Step 2: Convert to fraction form
    1,939.42/2,909.09 = 478.57/x
  3. Step 3: Cross multiply
    1,939.42x = 2,909.09 × 478.57
  4. Step 4: Simplify right side
    1,939.42x = 1,392,203.20
  5. Step 5: Solve for x
    x = 1,392,203.20/1,939.42
  6. Step 6: Final answer
    x = 717.85

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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.