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Finding the Fourth Proportional to 128,280.87, 192,452.62 and 90,404.02

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Solution

The fourth proportional to 128,280.87, 192,452.62 and 90,404.02 is: 135,628.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,280.87 : 192,452.62 = 90,404.02 : x
  2. Step 2: Convert to fraction form
    128,280.87/192,452.62 = 90,404.02/x
  3. Step 3: Cross multiply
    128,280.87x = 192,452.62 × 90,404.02
  4. Step 4: Simplify right side
    128,280.87x = 17,398,490,507.53
  5. Step 5: Solve for x
    x = 17,398,490,507.53/128,280.87
  6. Step 6: Final answer
    x = 135,628.10

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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.