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Finding the Fourth Proportional to 21,007.25, 28,989.62 and 11,447.22

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Solution

The fourth proportional to 21,007.25, 28,989.62 and 11,447.22 is: 15,796.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.25 : 28,989.62 = 11,447.22 : x
  2. Step 2: Convert to fraction form
    21,007.25/28,989.62 = 11,447.22/x
  3. Step 3: Cross multiply
    21,007.25x = 28,989.62 × 11,447.22
  4. Step 4: Simplify right side
    21,007.25x = 331,850,468.43
  5. Step 5: Solve for x
    x = 331,850,468.43/21,007.25
  6. Step 6: Final answer
    x = 15,796.95

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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.