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Finding the Fourth Proportional to 911.62, 1,367.62 and 391.64

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Solution

The fourth proportional to 911.62, 1,367.62 and 391.64 is: 587.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.62 : 1,367.62 = 391.64 : x
  2. Step 2: Convert to fraction form
    911.62/1,367.62 = 391.64/x
  3. Step 3: Cross multiply
    911.62x = 1,367.62 × 391.64
  4. Step 4: Simplify right side
    911.62x = 535,606.88
  5. Step 5: Solve for x
    x = 535,606.88/911.62
  6. Step 6: Final answer
    x = 587.53

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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.