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Finding the Fourth Proportional to 422.91, 629.34 and 406.51

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Solution

The fourth proportional to 422.91, 629.34 and 406.51 is: 604.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.91 : 629.34 = 406.51 : x
  2. Step 2: Convert to fraction form
    422.91/629.34 = 406.51/x
  3. Step 3: Cross multiply
    422.91x = 629.34 × 406.51
  4. Step 4: Simplify right side
    422.91x = 255,833.00
  5. Step 5: Solve for x
    x = 255,833.00/422.91
  6. Step 6: Final answer
    x = 604.93

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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.