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Finding the Fourth Proportional to 426,257.36, 639,380.44 and 122,659.44

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Solution

The fourth proportional to 426,257.36, 639,380.44 and 122,659.44 is: 183,987.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,257.36 : 639,380.44 = 122,659.44 : x
  2. Step 2: Convert to fraction form
    426,257.36/639,380.44 = 122,659.44/x
  3. Step 3: Cross multiply
    426,257.36x = 639,380.44 × 122,659.44
  4. Step 4: Simplify right side
    426,257.36x = 78,426,046,717.35
  5. Step 5: Solve for x
    x = 78,426,046,717.35/426,257.36
  6. Step 6: Final answer
    x = 183,987.55

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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.