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Finding the Fourth Proportional to 911.44, 1,367.16 and 638.56

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Solution

The fourth proportional to 911.44, 1,367.16 and 638.56 is: 957.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.44 : 1,367.16 = 638.56 : x
  2. Step 2: Convert to fraction form
    911.44/1,367.16 = 638.56/x
  3. Step 3: Cross multiply
    911.44x = 1,367.16 × 638.56
  4. Step 4: Simplify right side
    911.44x = 873,013.69
  5. Step 5: Solve for x
    x = 873,013.69/911.44
  6. Step 6: Final answer
    x = 957.84

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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.