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Finding the Fourth Proportional to 456.46, 629.42 and 308.84

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Solution

The fourth proportional to 456.46, 629.42 and 308.84 is: 425.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.46 : 629.42 = 308.84 : x
  2. Step 2: Convert to fraction form
    456.46/629.42 = 308.84/x
  3. Step 3: Cross multiply
    456.46x = 629.42 × 308.84
  4. Step 4: Simplify right side
    456.46x = 194,388.53
  5. Step 5: Solve for x
    x = 194,388.53/456.46
  6. Step 6: Final answer
    x = 425.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.