Home / 20,121.75-27,760.32-15,523.92

Finding the Fourth Proportional to 20,121.75, 27,760.32 and 15,523.92

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Solution

The fourth proportional to 20,121.75, 27,760.32 and 15,523.92 is: 21,417.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.75 : 27,760.32 = 15,523.92 : x
  2. Step 2: Convert to fraction form
    20,121.75/27,760.32 = 15,523.92/x
  3. Step 3: Cross multiply
    20,121.75x = 27,760.32 × 15,523.92
  4. Step 4: Simplify right side
    20,121.75x = 430,948,986.85
  5. Step 5: Solve for x
    x = 430,948,986.85/20,121.75
  6. Step 6: Final answer
    x = 21,417.07

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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.