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Finding the Fourth Proportional to 668.86, 997.39 and 622.69

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Solution

The fourth proportional to 668.86, 997.39 and 622.69 is: 928.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.86 : 997.39 = 622.69 : x
  2. Step 2: Convert to fraction form
    668.86/997.39 = 622.69/x
  3. Step 3: Cross multiply
    668.86x = 997.39 × 622.69
  4. Step 4: Simplify right side
    668.86x = 621,064.78
  5. Step 5: Solve for x
    x = 621,064.78/668.86
  6. Step 6: Final answer
    x = 928.54

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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.