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Finding the Fourth Proportional to 721.19, 995.36 and 455.85

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Solution

The fourth proportional to 721.19, 995.36 and 455.85 is: 629.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.19 : 995.36 = 455.85 : x
  2. Step 2: Convert to fraction form
    721.19/995.36 = 455.85/x
  3. Step 3: Cross multiply
    721.19x = 995.36 × 455.85
  4. Step 4: Simplify right side
    721.19x = 453,732.58
  5. Step 5: Solve for x
    x = 453,732.58/721.19
  6. Step 6: Final answer
    x = 629.14

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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.