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Finding the Fourth Proportional to 86,505.60, 129,758.40 and 81,256.80

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Solution

The fourth proportional to 86,505.60, 129,758.40 and 81,256.80 is: 121,885.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,505.60 : 129,758.40 = 81,256.80 : x
  2. Step 2: Convert to fraction form
    86,505.60/129,758.40 = 81,256.80/x
  3. Step 3: Cross multiply
    86,505.60x = 129,758.40 × 81,256.80
  4. Step 4: Simplify right side
    86,505.60x = 10,543,752,357.12
  5. Step 5: Solve for x
    x = 10,543,752,357.12/86,505.60
  6. Step 6: Final answer
    x = 121,885.20

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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.