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Finding the Fourth Proportional to 455.78, 629.18 and 308.86

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Solution

The fourth proportional to 455.78, 629.18 and 308.86 is: 426.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.78 : 629.18 = 308.86 : x
  2. Step 2: Convert to fraction form
    455.78/629.18 = 308.86/x
  3. Step 3: Cross multiply
    455.78x = 629.18 × 308.86
  4. Step 4: Simplify right side
    455.78x = 194,328.53
  5. Step 5: Solve for x
    x = 194,328.53/455.78
  6. Step 6: Final answer
    x = 426.36

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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.