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Finding the Fourth Proportional to 20,808.54, 28,721.79 and 11,860.88

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Solution

The fourth proportional to 20,808.54, 28,721.79 and 11,860.88 is: 16,371.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.54 : 28,721.79 = 11,860.88 : x
  2. Step 2: Convert to fraction form
    20,808.54/28,721.79 = 11,860.88/x
  3. Step 3: Cross multiply
    20,808.54x = 28,721.79 × 11,860.88
  4. Step 4: Simplify right side
    20,808.54x = 340,665,560.97
  5. Step 5: Solve for x
    x = 340,665,560.97/20,808.54
  6. Step 6: Final answer
    x = 16,371.43

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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.