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Finding the Fourth Proportional to 721.03, 995.17 and 455.45

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Solution

The fourth proportional to 721.03, 995.17 and 455.45 is: 628.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.03 : 995.17 = 455.45 : x
  2. Step 2: Convert to fraction form
    721.03/995.17 = 455.45/x
  3. Step 3: Cross multiply
    721.03x = 995.17 × 455.45
  4. Step 4: Simplify right side
    721.03x = 453,247.41
  5. Step 5: Solve for x
    x = 453,247.41/721.03
  6. Step 6: Final answer
    x = 628.61

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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.