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Finding the Fourth Proportional to 85,542.60, 128,532.60 and 75,919.80

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Solution

The fourth proportional to 85,542.60, 128,532.60 and 75,919.80 is: 114,073.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,542.60 : 128,532.60 = 75,919.80 : x
  2. Step 2: Convert to fraction form
    85,542.60/128,532.60 = 75,919.80/x
  3. Step 3: Cross multiply
    85,542.60x = 128,532.60 × 75,919.80
  4. Step 4: Simplify right side
    85,542.60x = 9,758,169,285.48
  5. Step 5: Solve for x
    x = 9,758,169,285.48/85,542.60
  6. Step 6: Final answer
    x = 114,073.80

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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.