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Finding the Fourth Proportional to 455.63, 629.40 and 308.90

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Solution

The fourth proportional to 455.63, 629.40 and 308.90 is: 426.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.63 : 629.40 = 308.90 : x
  2. Step 2: Convert to fraction form
    455.63/629.40 = 308.90/x
  3. Step 3: Cross multiply
    455.63x = 629.40 × 308.90
  4. Step 4: Simplify right side
    455.63x = 194,421.66
  5. Step 5: Solve for x
    x = 194,421.66/455.63
  6. Step 6: Final answer
    x = 426.71

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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.