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Finding the Fourth Proportional to 21,902.88, 30,218.64 and 12,469.44

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Solution

The fourth proportional to 21,902.88, 30,218.64 and 12,469.44 is: 17,203.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,902.88 : 30,218.64 = 12,469.44 : x
  2. Step 2: Convert to fraction form
    21,902.88/30,218.64 = 12,469.44/x
  3. Step 3: Cross multiply
    21,902.88x = 30,218.64 × 12,469.44
  4. Step 4: Simplify right side
    21,902.88x = 376,809,518.36
  5. Step 5: Solve for x
    x = 376,809,518.36/21,902.88
  6. Step 6: Final answer
    x = 17,203.65

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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.