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Finding the Fourth Proportional to 20,868, 28,799.12 and 12,036

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Solution

The fourth proportional to 20,868, 28,799.12 and 12,036 is: 16,610.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868 : 28,799.12 = 12,036 : x
  2. Step 2: Convert to fraction form
    20,868/28,799.12 = 12,036/x
  3. Step 3: Cross multiply
    20,868x = 28,799.12 × 12,036
  4. Step 4: Simplify right side
    20,868x = 346,626,208.32
  5. Step 5: Solve for x
    x = 346,626,208.32/20,868
  6. Step 6: Final answer
    x = 16,610.42

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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.