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Finding the Fourth Proportional to 663.51, 994.65 and 338.79

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Solution

The fourth proportional to 663.51, 994.65 and 338.79 is: 507.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.51 : 994.65 = 338.79 : x
  2. Step 2: Convert to fraction form
    663.51/994.65 = 338.79/x
  3. Step 3: Cross multiply
    663.51x = 994.65 × 338.79
  4. Step 4: Simplify right side
    663.51x = 336,977.47
  5. Step 5: Solve for x
    x = 336,977.47/663.51
  6. Step 6: Final answer
    x = 507.87

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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.