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Finding the Fourth Proportional to 961.50, 1,326.33 and 629.85

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Solution

The fourth proportional to 961.50, 1,326.33 and 629.85 is: 868.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.50 : 1,326.33 = 629.85 : x
  2. Step 2: Convert to fraction form
    961.50/1,326.33 = 629.85/x
  3. Step 3: Cross multiply
    961.50x = 1,326.33 × 629.85
  4. Step 4: Simplify right side
    961.50x = 835,388.95
  5. Step 5: Solve for x
    x = 835,388.95/961.50
  6. Step 6: Final answer
    x = 868.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.