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Finding the Fourth Proportional to 663.31, 995.51 and 338.77

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Solution

The fourth proportional to 663.31, 995.51 and 338.77 is: 508.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.31 : 995.51 = 338.77 : x
  2. Step 2: Convert to fraction form
    663.31/995.51 = 338.77/x
  3. Step 3: Cross multiply
    663.31x = 995.51 × 338.77
  4. Step 4: Simplify right side
    663.31x = 337,247.23
  5. Step 5: Solve for x
    x = 337,247.23/663.31
  6. Step 6: Final answer
    x = 508.43

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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.