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Finding the Fourth Proportional to 1,163.23, 1,605.27 and 639.25

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Solution

The fourth proportional to 1,163.23, 1,605.27 and 639.25 is: 882.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.23 : 1,605.27 = 639.25 : x
  2. Step 2: Convert to fraction form
    1,163.23/1,605.27 = 639.25/x
  3. Step 3: Cross multiply
    1,163.23x = 1,605.27 × 639.25
  4. Step 4: Simplify right side
    1,163.23x = 1,026,168.85
  5. Step 5: Solve for x
    x = 1,026,168.85/1,163.23
  6. Step 6: Final answer
    x = 882.17

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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.