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Finding the Fourth Proportional to 18,714.80, 25,815.60 and 11,998.08

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Solution

The fourth proportional to 18,714.80, 25,815.60 and 11,998.08 is: 16,550.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,714.80 : 25,815.60 = 11,998.08 : x
  2. Step 2: Convert to fraction form
    18,714.80/25,815.60 = 11,998.08/x
  3. Step 3: Cross multiply
    18,714.80x = 25,815.60 × 11,998.08
  4. Step 4: Simplify right side
    18,714.80x = 309,737,634.05
  5. Step 5: Solve for x
    x = 309,737,634.05/18,714.80
  6. Step 6: Final answer
    x = 16,550.41

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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.