Home / 21,865.80-30,179.29-13,906.49

Finding the Fourth Proportional to 21,865.80, 30,179.29 and 13,906.49

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Solution

The fourth proportional to 21,865.80, 30,179.29 and 13,906.49 is: 19,193.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,865.80 : 30,179.29 = 13,906.49 : x
  2. Step 2: Convert to fraction form
    21,865.80/30,179.29 = 13,906.49/x
  3. Step 3: Cross multiply
    21,865.80x = 30,179.29 × 13,906.49
  4. Step 4: Simplify right side
    21,865.80x = 419,687,994.59
  5. Step 5: Solve for x
    x = 419,687,994.59/21,865.80
  6. Step 6: Final answer
    x = 19,193.81

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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.