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Finding the Fourth Proportional to 455.56, 629 and 308.47

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Solution

The fourth proportional to 455.56, 629 and 308.47 is: 425.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.56 : 629 = 308.47 : x
  2. Step 2: Convert to fraction form
    455.56/629 = 308.47/x
  3. Step 3: Cross multiply
    455.56x = 629 × 308.47
  4. Step 4: Simplify right side
    455.56x = 194,027.63
  5. Step 5: Solve for x
    x = 194,027.63/455.56
  6. Step 6: Final answer
    x = 425.91

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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.