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Finding the Fourth Proportional to 421.46, 629.09 and 372.20

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Solution

The fourth proportional to 421.46, 629.09 and 372.20 is: 555.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.46 : 629.09 = 372.20 : x
  2. Step 2: Convert to fraction form
    421.46/629.09 = 372.20/x
  3. Step 3: Cross multiply
    421.46x = 629.09 × 372.20
  4. Step 4: Simplify right side
    421.46x = 234,145.44
  5. Step 5: Solve for x
    x = 234,145.44/421.46
  6. Step 6: Final answer
    x = 555.56

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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.