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Finding the Fourth Proportional to 207,968.72, 311,979 and 67,689.68

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Solution

The fourth proportional to 207,968.72, 311,979 and 67,689.68 is: 101,542.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,968.72 : 311,979 = 67,689.68 : x
  2. Step 2: Convert to fraction form
    207,968.72/311,979 = 67,689.68/x
  3. Step 3: Cross multiply
    207,968.72x = 311,979 × 67,689.68
  4. Step 4: Simplify right side
    207,968.72x = 21,117,758,676.72
  5. Step 5: Solve for x
    x = 21,117,758,676.72/207,968.72
  6. Step 6: Final answer
    x = 101,542.96

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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.