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Finding the Fourth Proportional to 21,899.25, 30,221.10 and 11,963.25

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Solution

The fourth proportional to 21,899.25, 30,221.10 and 11,963.25 is: 16,509.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,899.25 : 30,221.10 = 11,963.25 : x
  2. Step 2: Convert to fraction form
    21,899.25/30,221.10 = 11,963.25/x
  3. Step 3: Cross multiply
    21,899.25x = 30,221.10 × 11,963.25
  4. Step 4: Simplify right side
    21,899.25x = 361,542,574.58
  5. Step 5: Solve for x
    x = 361,542,574.58/21,899.25
  6. Step 6: Final answer
    x = 16,509.36

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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.