Home / 21,920.82-30,251.25-12,489.18

Finding the Fourth Proportional to 21,920.82, 30,251.25 and 12,489.18

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Solution

The fourth proportional to 21,920.82, 30,251.25 and 12,489.18 is: 17,235.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.82 : 30,251.25 = 12,489.18 : x
  2. Step 2: Convert to fraction form
    21,920.82/30,251.25 = 12,489.18/x
  3. Step 3: Cross multiply
    21,920.82x = 30,251.25 × 12,489.18
  4. Step 4: Simplify right side
    21,920.82x = 377,813,306.48
  5. Step 5: Solve for x
    x = 377,813,306.48/21,920.82
  6. Step 6: Final answer
    x = 17,235.36

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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.