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Finding the Fourth Proportional to 639.09, 881.80 and 429.66

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Solution

The fourth proportional to 639.09, 881.80 and 429.66 is: 592.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.09 : 881.80 = 429.66 : x
  2. Step 2: Convert to fraction form
    639.09/881.80 = 429.66/x
  3. Step 3: Cross multiply
    639.09x = 881.80 × 429.66
  4. Step 4: Simplify right side
    639.09x = 378,873.11
  5. Step 5: Solve for x
    x = 378,873.11/639.09
  6. Step 6: Final answer
    x = 592.83

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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.