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Finding the Fourth Proportional to 663.76, 995.28 and 321.76

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Solution

The fourth proportional to 663.76, 995.28 and 321.76 is: 482.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.76 : 995.28 = 321.76 : x
  2. Step 2: Convert to fraction form
    663.76/995.28 = 321.76/x
  3. Step 3: Cross multiply
    663.76x = 995.28 × 321.76
  4. Step 4: Simplify right side
    663.76x = 320,241.29
  5. Step 5: Solve for x
    x = 320,241.29/663.76
  6. Step 6: Final answer
    x = 482.47

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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.