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Finding the Fourth Proportional to 1,163.67, 1,743.85 and 643.90

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Solution

The fourth proportional to 1,163.67, 1,743.85 and 643.90 is: 964.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.67 : 1,743.85 = 643.90 : x
  2. Step 2: Convert to fraction form
    1,163.67/1,743.85 = 643.90/x
  3. Step 3: Cross multiply
    1,163.67x = 1,743.85 × 643.90
  4. Step 4: Simplify right side
    1,163.67x = 1,122,866.54
  5. Step 5: Solve for x
    x = 1,122,866.54/1,163.67
  6. Step 6: Final answer
    x = 964.94

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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.