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Finding the Fourth Proportional to 639.33, 882.21 and 429.75

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Solution

The fourth proportional to 639.33, 882.21 and 429.75 is: 593.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.33 : 882.21 = 429.75 : x
  2. Step 2: Convert to fraction form
    639.33/882.21 = 429.75/x
  3. Step 3: Cross multiply
    639.33x = 882.21 × 429.75
  4. Step 4: Simplify right side
    639.33x = 379,129.75
  5. Step 5: Solve for x
    x = 379,129.75/639.33
  6. Step 6: Final answer
    x = 593.01

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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.