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Finding the Fourth Proportional to 21,990.78, 30,347.22 and 11,919.48

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Solution

The fourth proportional to 21,990.78, 30,347.22 and 11,919.48 is: 16,448.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.78 : 30,347.22 = 11,919.48 : x
  2. Step 2: Convert to fraction form
    21,990.78/30,347.22 = 11,919.48/x
  3. Step 3: Cross multiply
    21,990.78x = 30,347.22 × 11,919.48
  4. Step 4: Simplify right side
    21,990.78x = 361,723,081.85
  5. Step 5: Solve for x
    x = 361,723,081.85/21,990.78
  6. Step 6: Final answer
    x = 16,448.85

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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.