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Finding the Fourth Proportional to 21,855.68, 30,161.04 and 11,919.68

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Solution

The fourth proportional to 21,855.68, 30,161.04 and 11,919.68 is: 16,449.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,855.68 : 30,161.04 = 11,919.68 : x
  2. Step 2: Convert to fraction form
    21,855.68/30,161.04 = 11,919.68/x
  3. Step 3: Cross multiply
    21,855.68x = 30,161.04 × 11,919.68
  4. Step 4: Simplify right side
    21,855.68x = 359,509,945.27
  5. Step 5: Solve for x
    x = 359,509,945.27/21,855.68
  6. Step 6: Final answer
    x = 16,449.27

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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.