Home / 21,990.12-32,981.52-7,947.42

Finding the Fourth Proportional to 21,990.12, 32,981.52 and 7,947.42

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Solution

The fourth proportional to 21,990.12, 32,981.52 and 7,947.42 is: 11,919.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.12 : 32,981.52 = 7,947.42 : x
  2. Step 2: Convert to fraction form
    21,990.12/32,981.52 = 7,947.42/x
  3. Step 3: Cross multiply
    21,990.12x = 32,981.52 × 7,947.42
  4. Step 4: Simplify right side
    21,990.12x = 262,117,991.68
  5. Step 5: Solve for x
    x = 262,117,991.68/21,990.12
  6. Step 6: Final answer
    x = 11,919.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.