Home / 20,375.78-28,120.42-11,877.23

Finding the Fourth Proportional to 20,375.78, 28,120.42 and 11,877.23

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Solution

The fourth proportional to 20,375.78, 28,120.42 and 11,877.23 is: 16,391.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,375.78 : 28,120.42 = 11,877.23 : x
  2. Step 2: Convert to fraction form
    20,375.78/28,120.42 = 11,877.23/x
  3. Step 3: Cross multiply
    20,375.78x = 28,120.42 × 11,877.23
  4. Step 4: Simplify right side
    20,375.78x = 333,992,714.37
  5. Step 5: Solve for x
    x = 333,992,714.37/20,375.78
  6. Step 6: Final answer
    x = 16,391.65

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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.