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Finding the Fourth Proportional to 721.20, 995.90 and 574.49

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Solution

The fourth proportional to 721.20, 995.90 and 574.49 is: 793.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.20 : 995.90 = 574.49 : x
  2. Step 2: Convert to fraction form
    721.20/995.90 = 574.49/x
  3. Step 3: Cross multiply
    721.20x = 995.90 × 574.49
  4. Step 4: Simplify right side
    721.20x = 572,134.21
  5. Step 5: Solve for x
    x = 572,134.21/721.20
  6. Step 6: Final answer
    x = 793.30

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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.