Home / 21,825.75-30,118.11-12,871.20

Finding the Fourth Proportional to 21,825.75, 30,118.11 and 12,871.20

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Solution

The fourth proportional to 21,825.75, 30,118.11 and 12,871.20 is: 17,761.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,825.75 : 30,118.11 = 12,871.20 : x
  2. Step 2: Convert to fraction form
    21,825.75/30,118.11 = 12,871.20/x
  3. Step 3: Cross multiply
    21,825.75x = 30,118.11 × 12,871.20
  4. Step 4: Simplify right side
    21,825.75x = 387,656,217.43
  5. Step 5: Solve for x
    x = 387,656,217.43/21,825.75
  6. Step 6: Final answer
    x = 17,761.42

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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.