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Finding the Fourth Proportional to 140,571.90, 193,989.69 and 76,909.50

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Solution

The fourth proportional to 140,571.90, 193,989.69 and 76,909.50 is: 106,135.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,571.90 : 193,989.69 = 76,909.50 : x
  2. Step 2: Convert to fraction form
    140,571.90/193,989.69 = 76,909.50/x
  3. Step 3: Cross multiply
    140,571.90x = 193,989.69 × 76,909.50
  4. Step 4: Simplify right side
    140,571.90x = 14,919,650,063.06
  5. Step 5: Solve for x
    x = 14,919,650,063.06/140,571.90
  6. Step 6: Final answer
    x = 106,135.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.