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Finding the Fourth Proportional to 995.46, 1,372.65 and 622.31

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Solution

The fourth proportional to 995.46, 1,372.65 and 622.31 is: 858.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.46 : 1,372.65 = 622.31 : x
  2. Step 2: Convert to fraction form
    995.46/1,372.65 = 622.31/x
  3. Step 3: Cross multiply
    995.46x = 1,372.65 × 622.31
  4. Step 4: Simplify right side
    995.46x = 854,213.82
  5. Step 5: Solve for x
    x = 854,213.82/995.46
  6. Step 6: Final answer
    x = 858.11

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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.