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Finding the Fourth Proportional to 21,898.08, 30,253.68 and 20,819.16

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Solution

The fourth proportional to 21,898.08, 30,253.68 and 20,819.16 is: 28,763.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,898.08 : 30,253.68 = 20,819.16 : x
  2. Step 2: Convert to fraction form
    21,898.08/30,253.68 = 20,819.16/x
  3. Step 3: Cross multiply
    21,898.08x = 30,253.68 × 20,819.16
  4. Step 4: Simplify right side
    21,898.08x = 629,856,204.51
  5. Step 5: Solve for x
    x = 629,856,204.51/21,898.08
  6. Step 6: Final answer
    x = 28,763.08

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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.