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Finding the Fourth Proportional to 1,163.24, 1,605.30 and 639.32

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Solution

The fourth proportional to 1,163.24, 1,605.30 and 639.32 is: 882.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.24 : 1,605.30 = 639.32 : x
  2. Step 2: Convert to fraction form
    1,163.24/1,605.30 = 639.32/x
  3. Step 3: Cross multiply
    1,163.24x = 1,605.30 × 639.32
  4. Step 4: Simplify right side
    1,163.24x = 1,026,300.40
  5. Step 5: Solve for x
    x = 1,026,300.40/1,163.24
  6. Step 6: Final answer
    x = 882.28

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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.