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Finding the Fourth Proportional to 77,190.11, 115,785.17 and 21,786.11

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Solution

The fourth proportional to 77,190.11, 115,785.17 and 21,786.11 is: 32,679.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,190.11 : 115,785.17 = 21,786.11 : x
  2. Step 2: Convert to fraction form
    77,190.11/115,785.17 = 21,786.11/x
  3. Step 3: Cross multiply
    77,190.11x = 115,785.17 × 21,786.11
  4. Step 4: Simplify right side
    77,190.11x = 2,522,508,449.99
  5. Step 5: Solve for x
    x = 2,522,508,449.99/77,190.11
  6. Step 6: Final answer
    x = 32,679.17

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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.