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Finding the Fourth Proportional to 139,511.86, 209,343.75 and 60,625.78

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Solution

The fourth proportional to 139,511.86, 209,343.75 and 60,625.78 is: 90,971.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,511.86 : 209,343.75 = 60,625.78 : x
  2. Step 2: Convert to fraction form
    139,511.86/209,343.75 = 60,625.78/x
  3. Step 3: Cross multiply
    139,511.86x = 209,343.75 × 60,625.78
  4. Step 4: Simplify right side
    139,511.86x = 12,691,628,131.88
  5. Step 5: Solve for x
    x = 12,691,628,131.88/139,511.86
  6. Step 6: Final answer
    x = 90,971.68

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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.