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Finding the Fourth Proportional to 207,431.69, 311,222.25 and 72,515.66

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Solution

The fourth proportional to 207,431.69, 311,222.25 and 72,515.66 is: 108,799.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,431.69 : 311,222.25 = 72,515.66 : x
  2. Step 2: Convert to fraction form
    207,431.69/311,222.25 = 72,515.66/x
  3. Step 3: Cross multiply
    207,431.69x = 311,222.25 × 72,515.66
  4. Step 4: Simplify right side
    207,431.69x = 22,568,485,309.32
  5. Step 5: Solve for x
    x = 22,568,485,309.32/207,431.69
  6. Step 6: Final answer
    x = 108,799.60

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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.