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Finding the Fourth Proportional to 20,862.51, 28,791.09 and 11,910.09

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Solution

The fourth proportional to 20,862.51, 28,791.09 and 11,910.09 is: 16,436.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.51 : 28,791.09 = 11,910.09 : x
  2. Step 2: Convert to fraction form
    20,862.51/28,791.09 = 11,910.09/x
  3. Step 3: Cross multiply
    20,862.51x = 28,791.09 × 11,910.09
  4. Step 4: Simplify right side
    20,862.51x = 342,904,473.10
  5. Step 5: Solve for x
    x = 342,904,473.10/20,862.51
  6. Step 6: Final answer
    x = 16,436.40

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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.