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Finding the Fourth Proportional to 463.34, 639.64 and 306.20

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Solution

The fourth proportional to 463.34, 639.64 and 306.20 is: 422.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.34 : 639.64 = 306.20 : x
  2. Step 2: Convert to fraction form
    463.34/639.64 = 306.20/x
  3. Step 3: Cross multiply
    463.34x = 639.64 × 306.20
  4. Step 4: Simplify right side
    463.34x = 195,857.77
  5. Step 5: Solve for x
    x = 195,857.77/463.34
  6. Step 6: Final answer
    x = 422.71

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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.