Home / 20,986.80-31,452.38-7,825.92

Finding the Fourth Proportional to 20,986.80, 31,452.38 and 7,825.92

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Solution

The fourth proportional to 20,986.80, 31,452.38 and 7,825.92 is: 11,728.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.80 : 31,452.38 = 7,825.92 : x
  2. Step 2: Convert to fraction form
    20,986.80/31,452.38 = 7,825.92/x
  3. Step 3: Cross multiply
    20,986.80x = 31,452.38 × 7,825.92
  4. Step 4: Simplify right side
    20,986.80x = 246,143,809.69
  5. Step 5: Solve for x
    x = 246,143,809.69/20,986.80
  6. Step 6: Final answer
    x = 11,728.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.