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Finding the Fourth Proportional to 721.37, 994.90 and 485.24

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Solution

The fourth proportional to 721.37, 994.90 and 485.24 is: 669.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.37 : 994.90 = 485.24 : x
  2. Step 2: Convert to fraction form
    721.37/994.90 = 485.24/x
  3. Step 3: Cross multiply
    721.37x = 994.90 × 485.24
  4. Step 4: Simplify right side
    721.37x = 482,765.28
  5. Step 5: Solve for x
    x = 482,765.28/721.37
  6. Step 6: Final answer
    x = 669.23

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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.