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Finding the Fourth Proportional to 721.67, 995.90 and 406.93

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Solution

The fourth proportional to 721.67, 995.90 and 406.93 is: 561.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.67 : 995.90 = 406.93 : x
  2. Step 2: Convert to fraction form
    721.67/995.90 = 406.93/x
  3. Step 3: Cross multiply
    721.67x = 995.90 × 406.93
  4. Step 4: Simplify right side
    721.67x = 405,261.59
  5. Step 5: Solve for x
    x = 405,261.59/721.67
  6. Step 6: Final answer
    x = 561.56

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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.