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Finding the Fourth Proportional to 85,481.68, 128,107.89 and 66,529.19

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Solution

The fourth proportional to 85,481.68, 128,107.89 and 66,529.19 is: 99,704.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,481.68 : 128,107.89 = 66,529.19 : x
  2. Step 2: Convert to fraction form
    85,481.68/128,107.89 = 66,529.19/x
  3. Step 3: Cross multiply
    85,481.68x = 128,107.89 × 66,529.19
  4. Step 4: Simplify right side
    85,481.68x = 8,522,914,154.31
  5. Step 5: Solve for x
    x = 8,522,914,154.31/85,481.68
  6. Step 6: Final answer
    x = 99,704.57

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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.