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Finding the Fourth Proportional to 426,796.12, 640,263.30 and 131,239

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Solution

The fourth proportional to 426,796.12, 640,263.30 and 131,239 is: 196,879.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,796.12 : 640,263.30 = 131,239 : x
  2. Step 2: Convert to fraction form
    426,796.12/640,263.30 = 131,239/x
  3. Step 3: Cross multiply
    426,796.12x = 640,263.30 × 131,239
  4. Step 4: Simplify right side
    426,796.12x = 84,027,515,228.70
  5. Step 5: Solve for x
    x = 84,027,515,228.70/426,796.12
  6. Step 6: Final answer
    x = 196,879.75

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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.