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Finding the Fourth Proportional to 961.26, 1,441.75 and 311.91

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Solution

The fourth proportional to 961.26, 1,441.75 and 311.91 is: 467.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.26 : 1,441.75 = 311.91 : x
  2. Step 2: Convert to fraction form
    961.26/1,441.75 = 311.91/x
  3. Step 3: Cross multiply
    961.26x = 1,441.75 × 311.91
  4. Step 4: Simplify right side
    961.26x = 449,696.24
  5. Step 5: Solve for x
    x = 449,696.24/961.26
  6. Step 6: Final answer
    x = 467.82

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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.