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Finding the Fourth Proportional to 995.22, 1,372.68 and 663.12

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Solution

The fourth proportional to 995.22, 1,372.68 and 663.12 is: 914.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.22 : 1,372.68 = 663.12 : x
  2. Step 2: Convert to fraction form
    995.22/1,372.68 = 663.12/x
  3. Step 3: Cross multiply
    995.22x = 1,372.68 × 663.12
  4. Step 4: Simplify right side
    995.22x = 910,251.56
  5. Step 5: Solve for x
    x = 910,251.56/995.22
  6. Step 6: Final answer
    x = 914.62

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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.