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Finding the Fourth Proportional to 639.59, 881.81 and 429.43

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Solution

The fourth proportional to 639.59, 881.81 and 429.43 is: 592.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.59 : 881.81 = 429.43 : x
  2. Step 2: Convert to fraction form
    639.59/881.81 = 429.43/x
  3. Step 3: Cross multiply
    639.59x = 881.81 × 429.43
  4. Step 4: Simplify right side
    639.59x = 378,675.67
  5. Step 5: Solve for x
    x = 378,675.67/639.59
  6. Step 6: Final answer
    x = 592.06

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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.