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Finding the Fourth Proportional to 28,868, 39,837.92 and 15,620

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Solution

The fourth proportional to 28,868, 39,837.92 and 15,620 is: 21,555.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,868 : 39,837.92 = 15,620 : x
  2. Step 2: Convert to fraction form
    28,868/39,837.92 = 15,620/x
  3. Step 3: Cross multiply
    28,868x = 39,837.92 × 15,620
  4. Step 4: Simplify right side
    28,868x = 622,268,310.40
  5. Step 5: Solve for x
    x = 622,268,310.40/28,868
  6. Step 6: Final answer
    x = 21,555.64

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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.