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Finding the Fourth Proportional to 639.39, 881.64 and 452.55

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Solution

The fourth proportional to 639.39, 881.64 and 452.55 is: 624.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.39 : 881.64 = 452.55 : x
  2. Step 2: Convert to fraction form
    639.39/881.64 = 452.55/x
  3. Step 3: Cross multiply
    639.39x = 881.64 × 452.55
  4. Step 4: Simplify right side
    639.39x = 398,986.18
  5. Step 5: Solve for x
    x = 398,986.18/639.39
  6. Step 6: Final answer
    x = 624.01

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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.