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Finding the Fourth Proportional to 639.63, 881.91 and 377.55

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Solution

The fourth proportional to 639.63, 881.91 and 377.55 is: 520.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.63 : 881.91 = 377.55 : x
  2. Step 2: Convert to fraction form
    639.63/881.91 = 377.55/x
  3. Step 3: Cross multiply
    639.63x = 881.91 × 377.55
  4. Step 4: Simplify right side
    639.63x = 332,965.12
  5. Step 5: Solve for x
    x = 332,965.12/639.63
  6. Step 6: Final answer
    x = 520.56

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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.