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Finding the Fourth Proportional to 823.86, 1,233.36 and 640.62

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Solution

The fourth proportional to 823.86, 1,233.36 and 640.62 is: 959.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.86 : 1,233.36 = 640.62 : x
  2. Step 2: Convert to fraction form
    823.86/1,233.36 = 640.62/x
  3. Step 3: Cross multiply
    823.86x = 1,233.36 × 640.62
  4. Step 4: Simplify right side
    823.86x = 790,115.08
  5. Step 5: Solve for x
    x = 790,115.08/823.86
  6. Step 6: Final answer
    x = 959.04

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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.