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Finding the Fourth Proportional to 85,679.40, 128,453.20 and 43,524.84

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Solution

The fourth proportional to 85,679.40, 128,453.20 and 43,524.84 is: 65,253.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,679.40 : 128,453.20 = 43,524.84 : x
  2. Step 2: Convert to fraction form
    85,679.40/128,453.20 = 43,524.84/x
  3. Step 3: Cross multiply
    85,679.40x = 128,453.20 × 43,524.84
  4. Step 4: Simplify right side
    85,679.40x = 5,590,904,977.49
  5. Step 5: Solve for x
    x = 5,590,904,977.49/85,679.40
  6. Step 6: Final answer
    x = 65,253.78

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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.