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Finding the Fourth Proportional to 86,683.60, 130,025.40 and 71,909.20

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Solution

The fourth proportional to 86,683.60, 130,025.40 and 71,909.20 is: 107,863.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,683.60 : 130,025.40 = 71,909.20 : x
  2. Step 2: Convert to fraction form
    86,683.60/130,025.40 = 71,909.20/x
  3. Step 3: Cross multiply
    86,683.60x = 130,025.40 × 71,909.20
  4. Step 4: Simplify right side
    86,683.60x = 9,350,022,493.68
  5. Step 5: Solve for x
    x = 9,350,022,493.68/86,683.60
  6. Step 6: Final answer
    x = 107,863.80

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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.