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Finding the Fourth Proportional to 455.86, 629.27 and 308.68

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Solution

The fourth proportional to 455.86, 629.27 and 308.68 is: 426.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.86 : 629.27 = 308.68 : x
  2. Step 2: Convert to fraction form
    455.86/629.27 = 308.68/x
  3. Step 3: Cross multiply
    455.86x = 629.27 × 308.68
  4. Step 4: Simplify right side
    455.86x = 194,243.06
  5. Step 5: Solve for x
    x = 194,243.06/455.86
  6. Step 6: Final answer
    x = 426.10

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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.