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Finding the Fourth Proportional to 57,418.56, 86,125.41 and 19,987.11

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Solution

The fourth proportional to 57,418.56, 86,125.41 and 19,987.11 is: 29,979.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,418.56 : 86,125.41 = 19,987.11 : x
  2. Step 2: Convert to fraction form
    57,418.56/86,125.41 = 19,987.11/x
  3. Step 3: Cross multiply
    57,418.56x = 86,125.41 × 19,987.11
  4. Step 4: Simplify right side
    57,418.56x = 1,721,398,043.47
  5. Step 5: Solve for x
    x = 1,721,398,043.47/57,418.56
  6. Step 6: Final answer
    x = 29,979.82

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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.