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Finding the Fourth Proportional to 138,581.01, 191,290.95 and 81,992.25

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Solution

The fourth proportional to 138,581.01, 191,290.95 and 81,992.25 is: 113,178.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,581.01 : 191,290.95 = 81,992.25 : x
  2. Step 2: Convert to fraction form
    138,581.01/191,290.95 = 81,992.25/x
  3. Step 3: Cross multiply
    138,581.01x = 191,290.95 × 81,992.25
  4. Step 4: Simplify right side
    138,581.01x = 15,684,375,395.14
  5. Step 5: Solve for x
    x = 15,684,375,395.14/138,581.01
  6. Step 6: Final answer
    x = 113,178.39

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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.