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Finding the Fourth Proportional to 455.53, 629.13 and 308.56

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Solution

The fourth proportional to 455.53, 629.13 and 308.56 is: 426.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.53 : 629.13 = 308.56 : x
  2. Step 2: Convert to fraction form
    455.53/629.13 = 308.56/x
  3. Step 3: Cross multiply
    455.53x = 629.13 × 308.56
  4. Step 4: Simplify right side
    455.53x = 194,124.35
  5. Step 5: Solve for x
    x = 194,124.35/455.53
  6. Step 6: Final answer
    x = 426.15

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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.