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Finding the Fourth Proportional to 86,626.30, 129,939.45 and 81,814.90

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Solution

The fourth proportional to 86,626.30, 129,939.45 and 81,814.90 is: 122,722.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,626.30 : 129,939.45 = 81,814.90 : x
  2. Step 2: Convert to fraction form
    86,626.30/129,939.45 = 81,814.90/x
  3. Step 3: Cross multiply
    86,626.30x = 129,939.45 × 81,814.90
  4. Step 4: Simplify right side
    86,626.30x = 10,630,983,107.81
  5. Step 5: Solve for x
    x = 10,630,983,107.81/86,626.30
  6. Step 6: Final answer
    x = 122,722.35

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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.