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Finding the Fourth Proportional to 1,163.85, 1,606.05 and 639.87

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Solution

The fourth proportional to 1,163.85, 1,606.05 and 639.87 is: 882.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.85 : 1,606.05 = 639.87 : x
  2. Step 2: Convert to fraction form
    1,163.85/1,606.05 = 639.87/x
  3. Step 3: Cross multiply
    1,163.85x = 1,606.05 × 639.87
  4. Step 4: Simplify right side
    1,163.85x = 1,027,663.21
  5. Step 5: Solve for x
    x = 1,027,663.21/1,163.85
  6. Step 6: Final answer
    x = 882.99

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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.