Home / 21,930.99-30,257.46-12,981.57

Finding the Fourth Proportional to 21,930.99, 30,257.46 and 12,981.57

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Solution

The fourth proportional to 21,930.99, 30,257.46 and 12,981.57 is: 17,910.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,930.99 : 30,257.46 = 12,981.57 : x
  2. Step 2: Convert to fraction form
    21,930.99/30,257.46 = 12,981.57/x
  3. Step 3: Cross multiply
    21,930.99x = 30,257.46 × 12,981.57
  4. Step 4: Simplify right side
    21,930.99x = 392,789,335.01
  5. Step 5: Solve for x
    x = 392,789,335.01/21,930.99
  6. Step 6: Final answer
    x = 17,910.24

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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.