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Finding the Fourth Proportional to 455.74, 629.12 and 315.83

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Solution

The fourth proportional to 455.74, 629.12 and 315.83 is: 435.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.74 : 629.12 = 315.83 : x
  2. Step 2: Convert to fraction form
    455.74/629.12 = 315.83/x
  3. Step 3: Cross multiply
    455.74x = 629.12 × 315.83
  4. Step 4: Simplify right side
    455.74x = 198,694.97
  5. Step 5: Solve for x
    x = 198,694.97/455.74
  6. Step 6: Final answer
    x = 435.98

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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.