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Finding the Fourth Proportional to 128,422.64, 192,672.12 and 61,843.52

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Solution

The fourth proportional to 128,422.64, 192,672.12 and 61,843.52 is: 92,783.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,422.64 : 192,672.12 = 61,843.52 : x
  2. Step 2: Convert to fraction form
    128,422.64/192,672.12 = 61,843.52/x
  3. Step 3: Cross multiply
    128,422.64x = 192,672.12 × 61,843.52
  4. Step 4: Simplify right side
    128,422.64x = 11,915,522,106.66
  5. Step 5: Solve for x
    x = 11,915,522,106.66/128,422.64
  6. Step 6: Final answer
    x = 92,783.66

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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.