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Finding the Fourth Proportional to 674.21, 930.38 and 379.47

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Solution

The fourth proportional to 674.21, 930.38 and 379.47 is: 523.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.21 : 930.38 = 379.47 : x
  2. Step 2: Convert to fraction form
    674.21/930.38 = 379.47/x
  3. Step 3: Cross multiply
    674.21x = 930.38 × 379.47
  4. Step 4: Simplify right side
    674.21x = 353,051.30
  5. Step 5: Solve for x
    x = 353,051.30/674.21
  6. Step 6: Final answer
    x = 523.65

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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.