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Finding the Fourth Proportional to 639.75, 882.86 and 363.75

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Solution

The fourth proportional to 639.75, 882.86 and 363.75 is: 501.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.75 : 882.86 = 363.75 : x
  2. Step 2: Convert to fraction form
    639.75/882.86 = 363.75/x
  3. Step 3: Cross multiply
    639.75x = 882.86 × 363.75
  4. Step 4: Simplify right side
    639.75x = 321,138.51
  5. Step 5: Solve for x
    x = 321,138.51/639.75
  6. Step 6: Final answer
    x = 501.98

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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.