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Finding the Fourth Proportional to 639.30, 881.29 and 452.21

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Solution

The fourth proportional to 639.30, 881.29 and 452.21 is: 623.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.30 : 881.29 = 452.21 : x
  2. Step 2: Convert to fraction form
    639.30/881.29 = 452.21/x
  3. Step 3: Cross multiply
    639.30x = 881.29 × 452.21
  4. Step 4: Simplify right side
    639.30x = 398,524.82
  5. Step 5: Solve for x
    x = 398,524.82/639.30
  6. Step 6: Final answer
    x = 623.38

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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.