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Finding the Fourth Proportional to 721.59, 995.45 and 455.91

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Solution

The fourth proportional to 721.59, 995.45 and 455.91 is: 628.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.59 : 995.45 = 455.91 : x
  2. Step 2: Convert to fraction form
    721.59/995.45 = 455.91/x
  3. Step 3: Cross multiply
    721.59x = 995.45 × 455.91
  4. Step 4: Simplify right side
    721.59x = 453,835.61
  5. Step 5: Solve for x
    x = 453,835.61/721.59
  6. Step 6: Final answer
    x = 628.94

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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.