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Finding the Fourth Proportional to 445.97, 669.17 and 316.79

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Solution

The fourth proportional to 445.97, 669.17 and 316.79 is: 475.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.97 : 669.17 = 316.79 : x
  2. Step 2: Convert to fraction form
    445.97/669.17 = 316.79/x
  3. Step 3: Cross multiply
    445.97x = 669.17 × 316.79
  4. Step 4: Simplify right side
    445.97x = 211,981.43
  5. Step 5: Solve for x
    x = 211,981.43/445.97
  6. Step 6: Final answer
    x = 475.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.