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Finding the Fourth Proportional to 463, 639.12 and 276.64

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Solution

The fourth proportional to 463, 639.12 and 276.64 is: 381.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    463 : 639.12 = 276.64 : x
  2. Step 2: Convert to fraction form
    463/639.12 = 276.64/x
  3. Step 3: Cross multiply
    463x = 639.12 × 276.64
  4. Step 4: Simplify right side
    463x = 176,806.16
  5. Step 5: Solve for x
    x = 176,806.16/463
  6. Step 6: Final answer
    x = 381.87

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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.