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Finding the Fourth Proportional to 674.53, 930.78 and 379.79

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Solution

The fourth proportional to 674.53, 930.78 and 379.79 is: 524.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.53 : 930.78 = 379.79 : x
  2. Step 2: Convert to fraction form
    674.53/930.78 = 379.79/x
  3. Step 3: Cross multiply
    674.53x = 930.78 × 379.79
  4. Step 4: Simplify right side
    674.53x = 353,500.94
  5. Step 5: Solve for x
    x = 353,500.94/674.53
  6. Step 6: Final answer
    x = 524.07

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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.