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Finding the Fourth Proportional to 721.41, 995.64 and 426.81

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Solution

The fourth proportional to 721.41, 995.64 and 426.81 is: 589.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.41 : 995.64 = 426.81 : x
  2. Step 2: Convert to fraction form
    721.41/995.64 = 426.81/x
  3. Step 3: Cross multiply
    721.41x = 995.64 × 426.81
  4. Step 4: Simplify right side
    721.41x = 424,949.11
  5. Step 5: Solve for x
    x = 424,949.11/721.41
  6. Step 6: Final answer
    x = 589.05

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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.