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Finding the Fourth Proportional to 639.38, 882.32 and 453.18

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Solution

The fourth proportional to 639.38, 882.32 and 453.18 is: 625.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.38 : 882.32 = 453.18 : x
  2. Step 2: Convert to fraction form
    639.38/882.32 = 453.18/x
  3. Step 3: Cross multiply
    639.38x = 882.32 × 453.18
  4. Step 4: Simplify right side
    639.38x = 399,847.13
  5. Step 5: Solve for x
    x = 399,847.13/639.38
  6. Step 6: Final answer
    x = 625.37

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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.