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Finding the Fourth Proportional to 207,915.03, 311,906.19 and 81,486.72

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Solution

The fourth proportional to 207,915.03, 311,906.19 and 81,486.72 is: 122,243.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,915.03 : 311,906.19 = 81,486.72 : x
  2. Step 2: Convert to fraction form
    207,915.03/311,906.19 = 81,486.72/x
  3. Step 3: Cross multiply
    207,915.03x = 311,906.19 × 81,486.72
  4. Step 4: Simplify right side
    207,915.03x = 25,416,212,370.80
  5. Step 5: Solve for x
    x = 25,416,212,370.80/207,915.03
  6. Step 6: Final answer
    x = 122,243.27

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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.