Home / 20,391.82-28,138.05-11,439.29

Finding the Fourth Proportional to 20,391.82, 28,138.05 and 11,439.29

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Solution

The fourth proportional to 20,391.82, 28,138.05 and 11,439.29 is: 15,784.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.82 : 28,138.05 = 11,439.29 : x
  2. Step 2: Convert to fraction form
    20,391.82/28,138.05 = 11,439.29/x
  3. Step 3: Cross multiply
    20,391.82x = 28,138.05 × 11,439.29
  4. Step 4: Simplify right side
    20,391.82x = 321,879,384.33
  5. Step 5: Solve for x
    x = 321,879,384.33/20,391.82
  6. Step 6: Final answer
    x = 15,784.73

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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.