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Finding the Fourth Proportional to 21,906.88, 30,226.54 and 12,954.76

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Solution

The fourth proportional to 21,906.88, 30,226.54 and 12,954.76 is: 17,874.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,906.88 : 30,226.54 = 12,954.76 : x
  2. Step 2: Convert to fraction form
    21,906.88/30,226.54 = 12,954.76/x
  3. Step 3: Cross multiply
    21,906.88x = 30,226.54 × 12,954.76
  4. Step 4: Simplify right side
    21,906.88x = 391,577,355.42
  5. Step 5: Solve for x
    x = 391,577,355.42/21,906.88
  6. Step 6: Final answer
    x = 17,874.63

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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.