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Finding the Fourth Proportional to 721.13, 995.27 and 455.79

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Solution

The fourth proportional to 721.13, 995.27 and 455.79 is: 629.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.13 : 995.27 = 455.79 : x
  2. Step 2: Convert to fraction form
    721.13/995.27 = 455.79/x
  3. Step 3: Cross multiply
    721.13x = 995.27 × 455.79
  4. Step 4: Simplify right side
    721.13x = 453,634.11
  5. Step 5: Solve for x
    x = 453,634.11/721.13
  6. Step 6: Final answer
    x = 629.06

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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.