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Finding the Fourth Proportional to 721.40, 995.69 and 455.82

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Solution

The fourth proportional to 721.40, 995.69 and 455.82 is: 629.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.40 : 995.69 = 455.82 : x
  2. Step 2: Convert to fraction form
    721.40/995.69 = 455.82/x
  3. Step 3: Cross multiply
    721.40x = 995.69 × 455.82
  4. Step 4: Simplify right side
    721.40x = 453,858.58
  5. Step 5: Solve for x
    x = 453,858.58/721.40
  6. Step 6: Final answer
    x = 629.13

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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.