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Finding the Fourth Proportional to 639.23, 881.55 and 452.79

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Solution

The fourth proportional to 639.23, 881.55 and 452.79 is: 624.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.23 : 881.55 = 452.79 : x
  2. Step 2: Convert to fraction form
    639.23/881.55 = 452.79/x
  3. Step 3: Cross multiply
    639.23x = 881.55 × 452.79
  4. Step 4: Simplify right side
    639.23x = 399,157.02
  5. Step 5: Solve for x
    x = 399,157.02/639.23
  6. Step 6: Final answer
    x = 624.44

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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.