Home / 20,919.78-28,866.87-11,968.38

Finding the Fourth Proportional to 20,919.78, 28,866.87 and 11,968.38

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Solution

The fourth proportional to 20,919.78, 28,866.87 and 11,968.38 is: 16,514.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.78 : 28,866.87 = 11,968.38 : x
  2. Step 2: Convert to fraction form
    20,919.78/28,866.87 = 11,968.38/x
  3. Step 3: Cross multiply
    20,919.78x = 28,866.87 × 11,968.38
  4. Step 4: Simplify right side
    20,919.78x = 345,489,669.57
  5. Step 5: Solve for x
    x = 345,489,669.57/20,919.78
  6. Step 6: Final answer
    x = 16,514.98

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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.