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Finding the Fourth Proportional to 86,573.10, 129,859.65 and 81,324.30

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Solution

The fourth proportional to 86,573.10, 129,859.65 and 81,324.30 is: 121,986.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,573.10 : 129,859.65 = 81,324.30 : x
  2. Step 2: Convert to fraction form
    86,573.10/129,859.65 = 81,324.30/x
  3. Step 3: Cross multiply
    86,573.10x = 129,859.65 × 81,324.30
  4. Step 4: Simplify right side
    86,573.10x = 10,560,745,134.50
  5. Step 5: Solve for x
    x = 10,560,745,134.50/86,573.10
  6. Step 6: Final answer
    x = 121,986.45

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Double scale
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Similar ratio
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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.