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Finding the Fourth Proportional to 911.98, 1,367.80 and 262.56

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Solution

The fourth proportional to 911.98, 1,367.80 and 262.56 is: 393.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.98 : 1,367.80 = 262.56 : x
  2. Step 2: Convert to fraction form
    911.98/1,367.80 = 262.56/x
  3. Step 3: Cross multiply
    911.98x = 1,367.80 × 262.56
  4. Step 4: Simplify right side
    911.98x = 359,129.57
  5. Step 5: Solve for x
    x = 359,129.57/911.98
  6. Step 6: Final answer
    x = 393.79

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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.