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Finding the Fourth Proportional to 128,454.87, 192,549.87 and 53,618.57

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Solution

The fourth proportional to 128,454.87, 192,549.87 and 53,618.57 is: 80,372.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,454.87 : 192,549.87 = 53,618.57 : x
  2. Step 2: Convert to fraction form
    128,454.87/192,549.87 = 53,618.57/x
  3. Step 3: Cross multiply
    128,454.87x = 192,549.87 × 53,618.57
  4. Step 4: Simplify right side
    128,454.87x = 10,324,247,720.34
  5. Step 5: Solve for x
    x = 10,324,247,720.34/128,454.87
  6. Step 6: Final answer
    x = 80,372.57

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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.