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Finding the Fourth Proportional to 721.33, 995.53 and 406.61

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Solution

The fourth proportional to 721.33, 995.53 and 406.61 is: 561.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.33 : 995.53 = 406.61 : x
  2. Step 2: Convert to fraction form
    721.33/995.53 = 406.61/x
  3. Step 3: Cross multiply
    721.33x = 995.53 × 406.61
  4. Step 4: Simplify right side
    721.33x = 404,792.45
  5. Step 5: Solve for x
    x = 404,792.45/721.33
  6. Step 6: Final answer
    x = 561.18

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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.