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Finding the Fourth Proportional to 20,872.80, 28,801.44 and 11,918.88

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Solution

The fourth proportional to 20,872.80, 28,801.44 and 11,918.88 is: 16,446.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.80 : 28,801.44 = 11,918.88 : x
  2. Step 2: Convert to fraction form
    20,872.80/28,801.44 = 11,918.88/x
  3. Step 3: Cross multiply
    20,872.80x = 28,801.44 × 11,918.88
  4. Step 4: Simplify right side
    20,872.80x = 343,280,907.19
  5. Step 5: Solve for x
    x = 343,280,907.19/20,872.80
  6. Step 6: Final answer
    x = 16,446.33

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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.