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Finding the Fourth Proportional to 22,418.60, 30,936.47 and 12,857.99

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Solution

The fourth proportional to 22,418.60, 30,936.47 and 12,857.99 is: 17,743.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,418.60 : 30,936.47 = 12,857.99 : x
  2. Step 2: Convert to fraction form
    22,418.60/30,936.47 = 12,857.99/x
  3. Step 3: Cross multiply
    22,418.60x = 30,936.47 × 12,857.99
  4. Step 4: Simplify right side
    22,418.60x = 397,780,602.92
  5. Step 5: Solve for x
    x = 397,780,602.92/22,418.60
  6. Step 6: Final answer
    x = 17,743.33

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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.