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Finding the Fourth Proportional to 39,691.57, 54,774.17 and 21,786.88

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Solution

The fourth proportional to 39,691.57, 54,774.17 and 21,786.88 is: 30,065.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,691.57 : 54,774.17 = 21,786.88 : x
  2. Step 2: Convert to fraction form
    39,691.57/54,774.17 = 21,786.88/x
  3. Step 3: Cross multiply
    39,691.57x = 54,774.17 × 21,786.88
  4. Step 4: Simplify right side
    39,691.57x = 1,193,358,268.89
  5. Step 5: Solve for x
    x = 1,193,358,268.89/39,691.57
  6. Step 6: Final answer
    x = 30,065.79

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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.