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Finding the Fourth Proportional to 85,909.92, 128,883.42 and 25,933.43

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Solution

The fourth proportional to 85,909.92, 128,883.42 and 25,933.43 is: 38,905.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,909.92 : 128,883.42 = 25,933.43 : x
  2. Step 2: Convert to fraction form
    85,909.92/128,883.42 = 25,933.43/x
  3. Step 3: Cross multiply
    85,909.92x = 128,883.42 × 25,933.43
  4. Step 4: Simplify right side
    85,909.92x = 3,342,388,506.31
  5. Step 5: Solve for x
    x = 3,342,388,506.31/85,909.92
  6. Step 6: Final answer
    x = 38,905.73

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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.