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Finding the Fourth Proportional to 86,593.80, 129,890.70 and 66,910.80

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Solution

The fourth proportional to 86,593.80, 129,890.70 and 66,910.80 is: 100,366.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,593.80 : 129,890.70 = 66,910.80 : x
  2. Step 2: Convert to fraction form
    86,593.80/129,890.70 = 66,910.80/x
  3. Step 3: Cross multiply
    86,593.80x = 129,890.70 × 66,910.80
  4. Step 4: Simplify right side
    86,593.80x = 8,691,090,649.56
  5. Step 5: Solve for x
    x = 8,691,090,649.56/86,593.80
  6. Step 6: Final answer
    x = 100,366.20

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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.