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Finding the Fourth Proportional to 844.40, 1,263.90 and 660.80

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Solution

The fourth proportional to 844.40, 1,263.90 and 660.80 is: 989.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    844.40 : 1,263.90 = 660.80 : x
  2. Step 2: Convert to fraction form
    844.40/1,263.90 = 660.80/x
  3. Step 3: Cross multiply
    844.40x = 1,263.90 × 660.80
  4. Step 4: Simplify right side
    844.40x = 835,185.12
  5. Step 5: Solve for x
    x = 835,185.12/844.40
  6. Step 6: Final answer
    x = 989.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.