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Finding the Fourth Proportional to 20,891.97, 28,833 and 11,940.77

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Solution

The fourth proportional to 20,891.97, 28,833 and 11,940.77 is: 16,479.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.97 : 28,833 = 11,940.77 : x
  2. Step 2: Convert to fraction form
    20,891.97/28,833 = 11,940.77/x
  3. Step 3: Cross multiply
    20,891.97x = 28,833 × 11,940.77
  4. Step 4: Simplify right side
    20,891.97x = 344,288,077.25
  5. Step 5: Solve for x
    x = 344,288,077.25/20,891.97
  6. Step 6: Final answer
    x = 16,479.45

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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.