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Finding the Fourth Proportional to 639.67, 882.69 and 403.54

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Solution

The fourth proportional to 639.67, 882.69 and 403.54 is: 556.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.67 : 882.69 = 403.54 : x
  2. Step 2: Convert to fraction form
    639.67/882.69 = 403.54/x
  3. Step 3: Cross multiply
    639.67x = 882.69 × 403.54
  4. Step 4: Simplify right side
    639.67x = 356,200.72
  5. Step 5: Solve for x
    x = 356,200.72/639.67
  6. Step 6: Final answer
    x = 556.85

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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.