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Finding the Fourth Proportional to 721.72, 995.72 and 426.95

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Solution

The fourth proportional to 721.72, 995.72 and 426.95 is: 589.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.72 : 995.72 = 426.95 : x
  2. Step 2: Convert to fraction form
    721.72/995.72 = 426.95/x
  3. Step 3: Cross multiply
    721.72x = 995.72 × 426.95
  4. Step 4: Simplify right side
    721.72x = 425,122.65
  5. Step 5: Solve for x
    x = 425,122.65/721.72
  6. Step 6: Final answer
    x = 589.04

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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.