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Finding the Fourth Proportional to 1,163.44, 1,605.50 and 639.44

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Solution

The fourth proportional to 1,163.44, 1,605.50 and 639.44 is: 882.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.44 : 1,605.50 = 639.44 : x
  2. Step 2: Convert to fraction form
    1,163.44/1,605.50 = 639.44/x
  3. Step 3: Cross multiply
    1,163.44x = 1,605.50 × 639.44
  4. Step 4: Simplify right side
    1,163.44x = 1,026,620.92
  5. Step 5: Solve for x
    x = 1,026,620.92/1,163.44
  6. Step 6: Final answer
    x = 882.40

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1.5x scale

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.