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Finding the Fourth Proportional to 81,117.56, 111,880.51 and 69,806.09

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Solution

The fourth proportional to 81,117.56, 111,880.51 and 69,806.09 is: 96,279.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,117.56 : 111,880.51 = 69,806.09 : x
  2. Step 2: Convert to fraction form
    81,117.56/111,880.51 = 69,806.09/x
  3. Step 3: Cross multiply
    81,117.56x = 111,880.51 × 69,806.09
  4. Step 4: Simplify right side
    81,117.56x = 7,809,940,216.39
  5. Step 5: Solve for x
    x = 7,809,940,216.39/81,117.56
  6. Step 6: Final answer
    x = 96,279.29

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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.