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Finding the Fourth Proportional to 128,049.20, 192,246.60 and 81,393.20

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Solution

The fourth proportional to 128,049.20, 192,246.60 and 81,393.20 is: 122,199.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,049.20 : 192,246.60 = 81,393.20 : x
  2. Step 2: Convert to fraction form
    128,049.20/192,246.60 = 81,393.20/x
  3. Step 3: Cross multiply
    128,049.20x = 192,246.60 × 81,393.20
  4. Step 4: Simplify right side
    128,049.20x = 15,647,565,963.12
  5. Step 5: Solve for x
    x = 15,647,565,963.12/128,049.20
  6. Step 6: Final answer
    x = 122,199.64

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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.