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Finding the Fourth Proportional to 128,363.78, 192,578.61 and 53,459.03

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Solution

The fourth proportional to 128,363.78, 192,578.61 and 53,459.03 is: 80,202.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,363.78 : 192,578.61 = 53,459.03 : x
  2. Step 2: Convert to fraction form
    128,363.78/192,578.61 = 53,459.03/x
  3. Step 3: Cross multiply
    128,363.78x = 192,578.61 × 53,459.03
  4. Step 4: Simplify right side
    128,363.78x = 10,295,065,689.35
  5. Step 5: Solve for x
    x = 10,295,065,689.35/128,363.78
  6. Step 6: Final answer
    x = 80,202.26

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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.