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Finding the Fourth Proportional to 13,990.38, 20,998.53 and 7,069.74

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Solution

The fourth proportional to 13,990.38, 20,998.53 and 7,069.74 is: 10,611.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.38 : 20,998.53 = 7,069.74 : x
  2. Step 2: Convert to fraction form
    13,990.38/20,998.53 = 7,069.74/x
  3. Step 3: Cross multiply
    13,990.38x = 20,998.53 × 7,069.74
  4. Step 4: Simplify right side
    13,990.38x = 148,454,147.48
  5. Step 5: Solve for x
    x = 148,454,147.48/13,990.38
  6. Step 6: Final answer
    x = 10,611.16

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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.