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Finding the Fourth Proportional to 463.19, 639.21 and 276.79

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Solution

The fourth proportional to 463.19, 639.21 and 276.79 is: 381.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.19 : 639.21 = 276.79 : x
  2. Step 2: Convert to fraction form
    463.19/639.21 = 276.79/x
  3. Step 3: Cross multiply
    463.19x = 639.21 × 276.79
  4. Step 4: Simplify right side
    463.19x = 176,925.55
  5. Step 5: Solve for x
    x = 176,925.55/463.19
  6. Step 6: Final answer
    x = 381.97

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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.