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Finding the Fourth Proportional to 422.55, 629.64 and 371.52

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Solution

The fourth proportional to 422.55, 629.64 and 371.52 is: 553.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.55 : 629.64 = 371.52 : x
  2. Step 2: Convert to fraction form
    422.55/629.64 = 371.52/x
  3. Step 3: Cross multiply
    422.55x = 629.64 × 371.52
  4. Step 4: Simplify right side
    422.55x = 233,923.85
  5. Step 5: Solve for x
    x = 233,923.85/422.55
  6. Step 6: Final answer
    x = 553.60

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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.