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Finding the Fourth Proportional to 721.28, 995.70 and 472.88

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Solution

The fourth proportional to 721.28, 995.70 and 472.88 is: 652.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.28 : 995.70 = 472.88 : x
  2. Step 2: Convert to fraction form
    721.28/995.70 = 472.88/x
  3. Step 3: Cross multiply
    721.28x = 995.70 × 472.88
  4. Step 4: Simplify right side
    721.28x = 470,846.62
  5. Step 5: Solve for x
    x = 470,846.62/721.28
  6. Step 6: Final answer
    x = 652.79

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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.