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Finding the Fourth Proportional to 13,992.62, 20,988.20 and 5,226.84

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Solution

The fourth proportional to 13,992.62, 20,988.20 and 5,226.84 is: 7,839.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,992.62 : 20,988.20 = 5,226.84 : x
  2. Step 2: Convert to fraction form
    13,992.62/20,988.20 = 5,226.84/x
  3. Step 3: Cross multiply
    13,992.62x = 20,988.20 × 5,226.84
  4. Step 4: Simplify right side
    13,992.62x = 109,701,976.36
  5. Step 5: Solve for x
    x = 109,701,976.36/13,992.62
  6. Step 6: Final answer
    x = 7,839.99

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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.