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Finding the Fourth Proportional to 1,163.46, 1,605.78 and 721.56

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Solution

The fourth proportional to 1,163.46, 1,605.78 and 721.56 is: 995.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.46 : 1,605.78 = 721.56 : x
  2. Step 2: Convert to fraction form
    1,163.46/1,605.78 = 721.56/x
  3. Step 3: Cross multiply
    1,163.46x = 1,605.78 × 721.56
  4. Step 4: Simplify right side
    1,163.46x = 1,158,666.62
  5. Step 5: Solve for x
    x = 1,158,666.62/1,163.46
  6. Step 6: Final answer
    x = 995.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.