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Finding the Fourth Proportional to 128,138.40, 192,207.60 and 54,410.40

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Solution

The fourth proportional to 128,138.40, 192,207.60 and 54,410.40 is: 81,615.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,138.40 : 192,207.60 = 54,410.40 : x
  2. Step 2: Convert to fraction form
    128,138.40/192,207.60 = 54,410.40/x
  3. Step 3: Cross multiply
    128,138.40x = 192,207.60 × 54,410.40
  4. Step 4: Simplify right side
    128,138.40x = 10,458,092,399.04
  5. Step 5: Solve for x
    x = 10,458,092,399.04/128,138.40
  6. Step 6: Final answer
    x = 81,615.60

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1.5x scale

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.