Home / 21,991.28-30,347.80-11,919.74

Finding the Fourth Proportional to 21,991.28, 30,347.80 and 11,919.74

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Solution

The fourth proportional to 21,991.28, 30,347.80 and 11,919.74 is: 16,449.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.28 : 30,347.80 = 11,919.74 : x
  2. Step 2: Convert to fraction form
    21,991.28/30,347.80 = 11,919.74/x
  3. Step 3: Cross multiply
    21,991.28x = 30,347.80 × 11,919.74
  4. Step 4: Simplify right side
    21,991.28x = 361,737,704.03
  5. Step 5: Solve for x
    x = 361,737,704.03/21,991.28
  6. Step 6: Final answer
    x = 16,449.15

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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.