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Finding the Fourth Proportional to 674.45, 930.80 and 379.70

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Solution

The fourth proportional to 674.45, 930.80 and 379.70 is: 524.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.45 : 930.80 = 379.70 : x
  2. Step 2: Convert to fraction form
    674.45/930.80 = 379.70/x
  3. Step 3: Cross multiply
    674.45x = 930.80 × 379.70
  4. Step 4: Simplify right side
    674.45x = 353,422.86
  5. Step 5: Solve for x
    x = 353,422.86/674.45
  6. Step 6: Final answer
    x = 524.02

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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.