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Finding the Fourth Proportional to 85,806.49, 128,709.33 and 21,764.65

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Solution

The fourth proportional to 85,806.49, 128,709.33 and 21,764.65 is: 32,646.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,806.49 : 128,709.33 = 21,764.65 : x
  2. Step 2: Convert to fraction form
    85,806.49/128,709.33 = 21,764.65/x
  3. Step 3: Cross multiply
    85,806.49x = 128,709.33 × 21,764.65
  4. Step 4: Simplify right side
    85,806.49x = 2,801,313,519.18
  5. Step 5: Solve for x
    x = 2,801,313,519.18/85,806.49
  6. Step 6: Final answer
    x = 32,646.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.