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Finding the Fourth Proportional to 663.27, 993.36 and 640.20

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Solution

The fourth proportional to 663.27, 993.36 and 640.20 is: 958.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.27 : 993.36 = 640.20 : x
  2. Step 2: Convert to fraction form
    663.27/993.36 = 640.20/x
  3. Step 3: Cross multiply
    663.27x = 993.36 × 640.20
  4. Step 4: Simplify right side
    663.27x = 635,951.60
  5. Step 5: Solve for x
    x = 635,951.60/663.27
  6. Step 6: Final answer
    x = 958.82

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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.