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Finding the Fourth Proportional to 86,238.77, 129,358.71 and 30,078.66

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Solution

The fourth proportional to 86,238.77, 129,358.71 and 30,078.66 is: 45,118.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,238.77 : 129,358.71 = 30,078.66 : x
  2. Step 2: Convert to fraction form
    86,238.77/129,358.71 = 30,078.66/x
  3. Step 3: Cross multiply
    86,238.77x = 129,358.71 × 30,078.66
  4. Step 4: Simplify right side
    86,238.77x = 3,890,936,656.13
  5. Step 5: Solve for x
    x = 3,890,936,656.13/86,238.77
  6. Step 6: Final answer
    x = 45,118.19

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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.