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Finding the Fourth Proportional to 463.85, 639.92 and 306.56

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Solution

The fourth proportional to 463.85, 639.92 and 306.56 is: 422.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.85 : 639.92 = 306.56 : x
  2. Step 2: Convert to fraction form
    463.85/639.92 = 306.56/x
  3. Step 3: Cross multiply
    463.85x = 639.92 × 306.56
  4. Step 4: Simplify right side
    463.85x = 196,176.24
  5. Step 5: Solve for x
    x = 196,176.24/463.85
  6. Step 6: Final answer
    x = 422.93

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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.