Home / 21,940.11-30,275.69-12,380.89

Finding the Fourth Proportional to 21,940.11, 30,275.69 and 12,380.89

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Solution

The fourth proportional to 21,940.11, 30,275.69 and 12,380.89 is: 17,084.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,940.11 : 30,275.69 = 12,380.89 : x
  2. Step 2: Convert to fraction form
    21,940.11/30,275.69 = 12,380.89/x
  3. Step 3: Cross multiply
    21,940.11x = 30,275.69 × 12,380.89
  4. Step 4: Simplify right side
    21,940.11x = 374,839,839.53
  5. Step 5: Solve for x
    x = 374,839,839.53/21,940.11
  6. Step 6: Final answer
    x = 17,084.68

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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.