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Finding the Fourth Proportional to 823.32, 1,236.21 and 517.11

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Solution

The fourth proportional to 823.32, 1,236.21 and 517.11 is: 776.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.32 : 1,236.21 = 517.11 : x
  2. Step 2: Convert to fraction form
    823.32/1,236.21 = 517.11/x
  3. Step 3: Cross multiply
    823.32x = 1,236.21 × 517.11
  4. Step 4: Simplify right side
    823.32x = 639,256.55
  5. Step 5: Solve for x
    x = 639,256.55/823.32
  6. Step 6: Final answer
    x = 776.44

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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.