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Finding the Fourth Proportional to 721.25, 995.38 and 406.55

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Solution

The fourth proportional to 721.25, 995.38 and 406.55 is: 561.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.25 : 995.38 = 406.55 : x
  2. Step 2: Convert to fraction form
    721.25/995.38 = 406.55/x
  3. Step 3: Cross multiply
    721.25x = 995.38 × 406.55
  4. Step 4: Simplify right side
    721.25x = 404,674.74
  5. Step 5: Solve for x
    x = 404,674.74/721.25
  6. Step 6: Final answer
    x = 561.07

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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.