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Finding the Fourth Proportional to 636.40, 949.99 and 550.28

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Solution

The fourth proportional to 636.40, 949.99 and 550.28 is: 821.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.40 : 949.99 = 550.28 : x
  2. Step 2: Convert to fraction form
    636.40/949.99 = 550.28/x
  3. Step 3: Cross multiply
    636.40x = 949.99 × 550.28
  4. Step 4: Simplify right side
    636.40x = 522,761.50
  5. Step 5: Solve for x
    x = 522,761.50/636.40
  6. Step 6: Final answer
    x = 821.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.