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Finding the Fourth Proportional to 674.70, 931.11 and 379.90

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Solution

The fourth proportional to 674.70, 931.11 and 379.90 is: 524.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.70 : 931.11 = 379.90 : x
  2. Step 2: Convert to fraction form
    674.70/931.11 = 379.90/x
  3. Step 3: Cross multiply
    674.70x = 931.11 × 379.90
  4. Step 4: Simplify right side
    674.70x = 353,728.69
  5. Step 5: Solve for x
    x = 353,728.69/674.70
  6. Step 6: Final answer
    x = 524.28

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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.