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Finding the Fourth Proportional to 682.45, 941.79 and 387.66

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Solution

The fourth proportional to 682.45, 941.79 and 387.66 is: 534.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.45 : 941.79 = 387.66 : x
  2. Step 2: Convert to fraction form
    682.45/941.79 = 387.66/x
  3. Step 3: Cross multiply
    682.45x = 941.79 × 387.66
  4. Step 4: Simplify right side
    682.45x = 365,092.37
  5. Step 5: Solve for x
    x = 365,092.37/682.45
  6. Step 6: Final answer
    x = 534.97

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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.