Home / 20,378.97-28,122.62-11,426.44

Finding the Fourth Proportional to 20,378.97, 28,122.62 and 11,426.44

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Solution

The fourth proportional to 20,378.97, 28,122.62 and 11,426.44 is: 15,768.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.97 : 28,122.62 = 11,426.44 : x
  2. Step 2: Convert to fraction form
    20,378.97/28,122.62 = 11,426.44/x
  3. Step 3: Cross multiply
    20,378.97x = 28,122.62 × 11,426.44
  4. Step 4: Simplify right side
    20,378.97x = 321,341,443.25
  5. Step 5: Solve for x
    x = 321,341,443.25/20,378.97
  6. Step 6: Final answer
    x = 15,768.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.