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Finding the Fourth Proportional to 21,963.05, 30,309.05 and 11,891.60

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Solution

The fourth proportional to 21,963.05, 30,309.05 and 11,891.60 is: 16,410.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,963.05 : 30,309.05 = 11,891.60 : x
  2. Step 2: Convert to fraction form
    21,963.05/30,309.05 = 11,891.60/x
  3. Step 3: Cross multiply
    21,963.05x = 30,309.05 × 11,891.60
  4. Step 4: Simplify right side
    21,963.05x = 360,423,098.98
  5. Step 5: Solve for x
    x = 360,423,098.98/21,963.05
  6. Step 6: Final answer
    x = 16,410.43

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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.