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Finding the Fourth Proportional to 721.20, 995.20 and 441.40

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Solution

The fourth proportional to 721.20, 995.20 and 441.40 is: 609.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.20 : 995.20 = 441.40 : x
  2. Step 2: Convert to fraction form
    721.20/995.20 = 441.40/x
  3. Step 3: Cross multiply
    721.20x = 995.20 × 441.40
  4. Step 4: Simplify right side
    721.20x = 439,281.28
  5. Step 5: Solve for x
    x = 439,281.28/721.20
  6. Step 6: Final answer
    x = 609.10

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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.