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Finding the Fourth Proportional to 721.56, 995.73 and 406.82

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Solution

The fourth proportional to 721.56, 995.73 and 406.82 is: 561.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.56 : 995.73 = 406.82 : x
  2. Step 2: Convert to fraction form
    721.56/995.73 = 406.82/x
  3. Step 3: Cross multiply
    721.56x = 995.73 × 406.82
  4. Step 4: Simplify right side
    721.56x = 405,082.88
  5. Step 5: Solve for x
    x = 405,082.88/721.56
  6. Step 6: Final answer
    x = 561.40

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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.