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Finding the Fourth Proportional to 22,425.80, 30,938.10 and 12,990.92

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Solution

The fourth proportional to 22,425.80, 30,938.10 and 12,990.92 is: 17,921.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,425.80 : 30,938.10 = 12,990.92 : x
  2. Step 2: Convert to fraction form
    22,425.80/30,938.10 = 12,990.92/x
  3. Step 3: Cross multiply
    22,425.80x = 30,938.10 × 12,990.92
  4. Step 4: Simplify right side
    22,425.80x = 401,914,382.05
  5. Step 5: Solve for x
    x = 401,914,382.05/22,425.80
  6. Step 6: Final answer
    x = 17,921.96

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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.