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Finding the Fourth Proportional to 463.40, 639.54 and 276.88

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Solution

The fourth proportional to 463.40, 639.54 and 276.88 is: 382.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.40 : 639.54 = 276.88 : x
  2. Step 2: Convert to fraction form
    463.40/639.54 = 276.88/x
  3. Step 3: Cross multiply
    463.40x = 639.54 × 276.88
  4. Step 4: Simplify right side
    463.40x = 177,075.84
  5. Step 5: Solve for x
    x = 177,075.84/463.40
  6. Step 6: Final answer
    x = 382.12

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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.