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Finding the Fourth Proportional to 21,819.20, 30,110.40 and 13,321.28

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Solution

The fourth proportional to 21,819.20, 30,110.40 and 13,321.28 is: 18,383.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,819.20 : 30,110.40 = 13,321.28 : x
  2. Step 2: Convert to fraction form
    21,819.20/30,110.40 = 13,321.28/x
  3. Step 3: Cross multiply
    21,819.20x = 30,110.40 × 13,321.28
  4. Step 4: Simplify right side
    21,819.20x = 401,109,069.31
  5. Step 5: Solve for x
    x = 401,109,069.31/21,819.20
  6. Step 6: Final answer
    x = 18,383.31

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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.