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Finding the Fourth Proportional to 85,408.56, 128,112.84 and 43,282.08

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Solution

The fourth proportional to 85,408.56, 128,112.84 and 43,282.08 is: 64,923.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,408.56 : 128,112.84 = 43,282.08 : x
  2. Step 2: Convert to fraction form
    85,408.56/128,112.84 = 43,282.08/x
  3. Step 3: Cross multiply
    85,408.56x = 128,112.84 × 43,282.08
  4. Step 4: Simplify right side
    85,408.56x = 5,544,990,189.91
  5. Step 5: Solve for x
    x = 5,544,990,189.91/85,408.56
  6. Step 6: Final answer
    x = 64,923.12

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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.