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Finding the Fourth Proportional to 639.11, 881.81 and 377.07

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Solution

The fourth proportional to 639.11, 881.81 and 377.07 is: 520.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.11 : 881.81 = 377.07 : x
  2. Step 2: Convert to fraction form
    639.11/881.81 = 377.07/x
  3. Step 3: Cross multiply
    639.11x = 881.81 × 377.07
  4. Step 4: Simplify right side
    639.11x = 332,502.21
  5. Step 5: Solve for x
    x = 332,502.21/639.11
  6. Step 6: Final answer
    x = 520.26

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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.