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Finding the Fourth Proportional to 21,067.80, 31,600.20 and 7,919.16

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Solution

The fourth proportional to 21,067.80, 31,600.20 and 7,919.16 is: 11,878.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,067.80 : 31,600.20 = 7,919.16 : x
  2. Step 2: Convert to fraction form
    21,067.80/31,600.20 = 7,919.16/x
  3. Step 3: Cross multiply
    21,067.80x = 31,600.20 × 7,919.16
  4. Step 4: Simplify right side
    21,067.80x = 250,247,039.83
  5. Step 5: Solve for x
    x = 250,247,039.83/21,067.80
  6. Step 6: Final answer
    x = 11,878.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.