Home / 21,940.80-30,278.16-11,869.20

Finding the Fourth Proportional to 21,940.80, 30,278.16 and 11,869.20

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Solution

The fourth proportional to 21,940.80, 30,278.16 and 11,869.20 is: 16,379.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,940.80 : 30,278.16 = 11,869.20 : x
  2. Step 2: Convert to fraction form
    21,940.80/30,278.16 = 11,869.20/x
  3. Step 3: Cross multiply
    21,940.80x = 30,278.16 × 11,869.20
  4. Step 4: Simplify right side
    21,940.80x = 359,377,536.67
  5. Step 5: Solve for x
    x = 359,377,536.67/21,940.80
  6. Step 6: Final answer
    x = 16,379.42

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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.