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Finding the Fourth Proportional to 626.19, 863.28 and 449.30

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Solution

The fourth proportional to 626.19, 863.28 and 449.30 is: 619.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.19 : 863.28 = 449.30 : x
  2. Step 2: Convert to fraction form
    626.19/863.28 = 449.30/x
  3. Step 3: Cross multiply
    626.19x = 863.28 × 449.30
  4. Step 4: Simplify right side
    626.19x = 387,867.39
  5. Step 5: Solve for x
    x = 387,867.39/626.19
  6. Step 6: Final answer
    x = 619.41

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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.