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Finding the Fourth Proportional to 639.09, 882.88 and 429.20

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Solution

The fourth proportional to 639.09, 882.88 and 429.20 is: 592.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.09 : 882.88 = 429.20 : x
  2. Step 2: Convert to fraction form
    639.09/882.88 = 429.20/x
  3. Step 3: Cross multiply
    639.09x = 882.88 × 429.20
  4. Step 4: Simplify right side
    639.09x = 378,927.68
  5. Step 5: Solve for x
    x = 378,927.68/639.09
  6. Step 6: Final answer
    x = 592.92

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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.