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Finding the Fourth Proportional to 86,571.10, 129,856.65 and 76,656.70

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Solution

The fourth proportional to 86,571.10, 129,856.65 and 76,656.70 is: 114,985.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,571.10 : 129,856.65 = 76,656.70 : x
  2. Step 2: Convert to fraction form
    86,571.10/129,856.65 = 76,656.70/x
  3. Step 3: Cross multiply
    86,571.10x = 129,856.65 × 76,656.70
  4. Step 4: Simplify right side
    86,571.10x = 9,954,382,262.06
  5. Step 5: Solve for x
    x = 9,954,382,262.06/86,571.10
  6. Step 6: Final answer
    x = 114,985.05

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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.