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Finding the Fourth Proportional to 668.20, 998.24 and 664.96

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Solution

The fourth proportional to 668.20, 998.24 and 664.96 is: 993.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.20 : 998.24 = 664.96 : x
  2. Step 2: Convert to fraction form
    668.20/998.24 = 664.96/x
  3. Step 3: Cross multiply
    668.20x = 998.24 × 664.96
  4. Step 4: Simplify right side
    668.20x = 663,789.67
  5. Step 5: Solve for x
    x = 663,789.67/668.20
  6. Step 6: Final answer
    x = 993.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.