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Finding the Fourth Proportional to 463.20, 639.20 and 276.65

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Solution

The fourth proportional to 463.20, 639.20 and 276.65 is: 381.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.20 : 639.20 = 276.65 : x
  2. Step 2: Convert to fraction form
    463.20/639.20 = 276.65/x
  3. Step 3: Cross multiply
    463.20x = 639.20 × 276.65
  4. Step 4: Simplify right side
    463.20x = 176,834.96
  5. Step 5: Solve for x
    x = 176,834.96/463.20
  6. Step 6: Final answer
    x = 381.77

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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.