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Finding the Fourth Proportional to 626.40, 863.78 and 439.83

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Solution

The fourth proportional to 626.40, 863.78 and 439.83 is: 606.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.40 : 863.78 = 439.83 : x
  2. Step 2: Convert to fraction form
    626.40/863.78 = 439.83/x
  3. Step 3: Cross multiply
    626.40x = 863.78 × 439.83
  4. Step 4: Simplify right side
    626.40x = 379,914.16
  5. Step 5: Solve for x
    x = 379,914.16/626.40
  6. Step 6: Final answer
    x = 606.50

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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.