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Finding the Fourth Proportional to 86,471.67, 128,847.92 and 77,039.22

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Solution

The fourth proportional to 86,471.67, 128,847.92 and 77,039.22 is: 114,793.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,471.67 : 128,847.92 = 77,039.22 : x
  2. Step 2: Convert to fraction form
    86,471.67/128,847.92 = 77,039.22/x
  3. Step 3: Cross multiply
    86,471.67x = 128,847.92 × 77,039.22
  4. Step 4: Simplify right side
    86,471.67x = 9,926,342,870.23
  5. Step 5: Solve for x
    x = 9,926,342,870.23/86,471.67
  6. Step 6: Final answer
    x = 114,793.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.