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Finding the Fourth Proportional to 138,181.77, 206,940.50 and 78,837.53

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Solution

The fourth proportional to 138,181.77, 206,940.50 and 78,837.53 is: 118,066.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,181.77 : 206,940.50 = 78,837.53 : x
  2. Step 2: Convert to fraction form
    138,181.77/206,940.50 = 78,837.53/x
  3. Step 3: Cross multiply
    138,181.77x = 206,940.50 × 78,837.53
  4. Step 4: Simplify right side
    138,181.77x = 16,314,677,436.60
  5. Step 5: Solve for x
    x = 16,314,677,436.60/138,181.77
  6. Step 6: Final answer
    x = 118,066.78

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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.