Home / 20,391.09-28,136.07-11,438.97

Finding the Fourth Proportional to 20,391.09, 28,136.07 and 11,438.97

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Solution

The fourth proportional to 20,391.09, 28,136.07 and 11,438.97 is: 15,783.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.09 : 28,136.07 = 11,438.97 : x
  2. Step 2: Convert to fraction form
    20,391.09/28,136.07 = 11,438.97/x
  3. Step 3: Cross multiply
    20,391.09x = 28,136.07 × 11,438.97
  4. Step 4: Simplify right side
    20,391.09x = 321,847,660.65
  5. Step 5: Solve for x
    x = 321,847,660.65/20,391.09
  6. Step 6: Final answer
    x = 15,783.74

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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.