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Finding the Fourth Proportional to 85,819.80, 128,729.70 and 39,163.80

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Solution

The fourth proportional to 85,819.80, 128,729.70 and 39,163.80 is: 58,745.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,819.80 : 128,729.70 = 39,163.80 : x
  2. Step 2: Convert to fraction form
    85,819.80/128,729.70 = 39,163.80/x
  3. Step 3: Cross multiply
    85,819.80x = 128,729.70 × 39,163.80
  4. Step 4: Simplify right side
    85,819.80x = 5,041,544,224.86
  5. Step 5: Solve for x
    x = 5,041,544,224.86/85,819.80
  6. Step 6: Final answer
    x = 58,745.70

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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.