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Finding the Fourth Proportional to 721.42, 995.70 and 422.70

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Solution

The fourth proportional to 721.42, 995.70 and 422.70 is: 583.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.42 : 995.70 = 422.70 : x
  2. Step 2: Convert to fraction form
    721.42/995.70 = 422.70/x
  3. Step 3: Cross multiply
    721.42x = 995.70 × 422.70
  4. Step 4: Simplify right side
    721.42x = 420,883.98
  5. Step 5: Solve for x
    x = 420,883.98/721.42
  6. Step 6: Final answer
    x = 583.41

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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.