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Finding the Fourth Proportional to 463.72, 639.87 and 394.06

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Solution

The fourth proportional to 463.72, 639.87 and 394.06 is: 543.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.72 : 639.87 = 394.06 : x
  2. Step 2: Convert to fraction form
    463.72/639.87 = 394.06/x
  3. Step 3: Cross multiply
    463.72x = 639.87 × 394.06
  4. Step 4: Simplify right side
    463.72x = 252,147.17
  5. Step 5: Solve for x
    x = 252,147.17/463.72
  6. Step 6: Final answer
    x = 543.75

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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.