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Finding the Fourth Proportional to 721.76, 995.28 and 488.48

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Solution

The fourth proportional to 721.76, 995.28 and 488.48 is: 673.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.76 : 995.28 = 488.48 : x
  2. Step 2: Convert to fraction form
    721.76/995.28 = 488.48/x
  3. Step 3: Cross multiply
    721.76x = 995.28 × 488.48
  4. Step 4: Simplify right side
    721.76x = 486,174.37
  5. Step 5: Solve for x
    x = 486,174.37/721.76
  6. Step 6: Final answer
    x = 673.60

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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.