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Finding the Fourth Proportional to 663.72, 995.38 and 316.88

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Solution

The fourth proportional to 663.72, 995.38 and 316.88 is: 475.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.72 : 995.38 = 316.88 : x
  2. Step 2: Convert to fraction form
    663.72/995.38 = 316.88/x
  3. Step 3: Cross multiply
    663.72x = 995.38 × 316.88
  4. Step 4: Simplify right side
    663.72x = 315,411.04
  5. Step 5: Solve for x
    x = 315,411.04/663.72
  6. Step 6: Final answer
    x = 475.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.