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Finding the Fourth Proportional to 663.64, 994.98 and 252.55

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Solution

The fourth proportional to 663.64, 994.98 and 252.55 is: 378.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.64 : 994.98 = 252.55 : x
  2. Step 2: Convert to fraction form
    663.64/994.98 = 252.55/x
  3. Step 3: Cross multiply
    663.64x = 994.98 × 252.55
  4. Step 4: Simplify right side
    663.64x = 251,279.71
  5. Step 5: Solve for x
    x = 251,279.71/663.64
  6. Step 6: Final answer
    x = 378.64

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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.