Home / 20,391.36-28,140.51-11,439.48

Finding the Fourth Proportional to 20,391.36, 28,140.51 and 11,439.48

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Solution

The fourth proportional to 20,391.36, 28,140.51 and 11,439.48 is: 15,786.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.36 : 28,140.51 = 11,439.48 : x
  2. Step 2: Convert to fraction form
    20,391.36/28,140.51 = 11,439.48/x
  3. Step 3: Cross multiply
    20,391.36x = 28,140.51 × 11,439.48
  4. Step 4: Simplify right side
    20,391.36x = 321,912,801.33
  5. Step 5: Solve for x
    x = 321,912,801.33/20,391.36
  6. Step 6: Final answer
    x = 15,786.73

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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.