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Finding the Fourth Proportional to 22,422.54, 30,942.78 and 12,990.90

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Solution

The fourth proportional to 22,422.54, 30,942.78 and 12,990.90 is: 17,927.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,422.54 : 30,942.78 = 12,990.90 : x
  2. Step 2: Convert to fraction form
    22,422.54/30,942.78 = 12,990.90/x
  3. Step 3: Cross multiply
    22,422.54x = 30,942.78 × 12,990.90
  4. Step 4: Simplify right side
    22,422.54x = 401,974,560.70
  5. Step 5: Solve for x
    x = 401,974,560.70/22,422.54
  6. Step 6: Final answer
    x = 17,927.25

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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.