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Finding the Fourth Proportional to 13,891.80, 20,816.10 and 7,308.12

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Solution

The fourth proportional to 13,891.80, 20,816.10 and 7,308.12 is: 10,950.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,891.80 : 20,816.10 = 7,308.12 : x
  2. Step 2: Convert to fraction form
    13,891.80/20,816.10 = 7,308.12/x
  3. Step 3: Cross multiply
    13,891.80x = 20,816.10 × 7,308.12
  4. Step 4: Simplify right side
    13,891.80x = 152,126,556.73
  5. Step 5: Solve for x
    x = 152,126,556.73/13,891.80
  6. Step 6: Final answer
    x = 10,950.82

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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.