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Finding the Fourth Proportional to 21,993.92, 30,351.44 and 12,561.92

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Solution

The fourth proportional to 21,993.92, 30,351.44 and 12,561.92 is: 17,335.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,993.92 : 30,351.44 = 12,561.92 : x
  2. Step 2: Convert to fraction form
    21,993.92/30,351.44 = 12,561.92/x
  3. Step 3: Cross multiply
    21,993.92x = 30,351.44 × 12,561.92
  4. Step 4: Simplify right side
    21,993.92x = 381,272,361.16
  5. Step 5: Solve for x
    x = 381,272,361.16/21,993.92
  6. Step 6: Final answer
    x = 17,335.35

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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.