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Finding the Fourth Proportional to 961.02, 1,324.69 and 680.65

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Solution

The fourth proportional to 961.02, 1,324.69 and 680.65 is: 938.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.02 : 1,324.69 = 680.65 : x
  2. Step 2: Convert to fraction form
    961.02/1,324.69 = 680.65/x
  3. Step 3: Cross multiply
    961.02x = 1,324.69 × 680.65
  4. Step 4: Simplify right side
    961.02x = 901,645.24
  5. Step 5: Solve for x
    x = 901,645.24/961.02
  6. Step 6: Final answer
    x = 938.22

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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.