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Finding the Fourth Proportional to 21,991.48, 30,348.28 and 11,919.92

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Solution

The fourth proportional to 21,991.48, 30,348.28 and 11,919.92 is: 16,449.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.48 : 30,348.28 = 11,919.92 : x
  2. Step 2: Convert to fraction form
    21,991.48/30,348.28 = 11,919.92/x
  3. Step 3: Cross multiply
    21,991.48x = 30,348.28 × 11,919.92
  4. Step 4: Simplify right side
    21,991.48x = 361,749,069.74
  5. Step 5: Solve for x
    x = 361,749,069.74/21,991.48
  6. Step 6: Final answer
    x = 16,449.51

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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.