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Finding the Fourth Proportional to 639.86, 882.91 and 360.08

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Solution

The fourth proportional to 639.86, 882.91 and 360.08 is: 496.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.86 : 882.91 = 360.08 : x
  2. Step 2: Convert to fraction form
    639.86/882.91 = 360.08/x
  3. Step 3: Cross multiply
    639.86x = 882.91 × 360.08
  4. Step 4: Simplify right side
    639.86x = 317,919.54
  5. Step 5: Solve for x
    x = 317,919.54/639.86
  6. Step 6: Final answer
    x = 496.86

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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.