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Finding the Fourth Proportional to 721.06, 994.79 and 455.43

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Solution

The fourth proportional to 721.06, 994.79 and 455.43 is: 628.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.06 : 994.79 = 455.43 : x
  2. Step 2: Convert to fraction form
    721.06/994.79 = 455.43/x
  3. Step 3: Cross multiply
    721.06x = 994.79 × 455.43
  4. Step 4: Simplify right side
    721.06x = 453,057.21
  5. Step 5: Solve for x
    x = 453,057.21/721.06
  6. Step 6: Final answer
    x = 628.32

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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.