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Finding the Fourth Proportional to 80,805.78, 121,043.40 and 65,866.14

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Solution

The fourth proportional to 80,805.78, 121,043.40 and 65,866.14 is: 98,664.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,805.78 : 121,043.40 = 65,866.14 : x
  2. Step 2: Convert to fraction form
    80,805.78/121,043.40 = 65,866.14/x
  3. Step 3: Cross multiply
    80,805.78x = 121,043.40 × 65,866.14
  4. Step 4: Simplify right side
    80,805.78x = 7,972,661,530.48
  5. Step 5: Solve for x
    x = 7,972,661,530.48/80,805.78
  6. Step 6: Final answer
    x = 98,664.50

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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.