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Finding the Fourth Proportional to 663.95, 995.31 and 338.60

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Solution

The fourth proportional to 663.95, 995.31 and 338.60 is: 507.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.95 : 995.31 = 338.60 : x
  2. Step 2: Convert to fraction form
    663.95/995.31 = 338.60/x
  3. Step 3: Cross multiply
    663.95x = 995.31 × 338.60
  4. Step 4: Simplify right side
    663.95x = 337,006.99
  5. Step 5: Solve for x
    x = 337,006.99/663.95
  6. Step 6: Final answer
    x = 507.58

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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.