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Finding the Fourth Proportional to 135,398.88, 186,856.87 and 81,682.74

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Solution

The fourth proportional to 135,398.88, 186,856.87 and 81,682.74 is: 112,726.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,398.88 : 186,856.87 = 81,682.74 : x
  2. Step 2: Convert to fraction form
    135,398.88/186,856.87 = 81,682.74/x
  3. Step 3: Cross multiply
    135,398.88x = 186,856.87 × 81,682.74
  4. Step 4: Simplify right side
    135,398.88x = 15,262,980,253.87
  5. Step 5: Solve for x
    x = 15,262,980,253.87/135,398.88
  6. Step 6: Final answer
    x = 112,726.05

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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.