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Finding the Fourth Proportional to 682.70, 942.09 and 387.99

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Solution

The fourth proportional to 682.70, 942.09 and 387.99 is: 535.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.70 : 942.09 = 387.99 : x
  2. Step 2: Convert to fraction form
    682.70/942.09 = 387.99/x
  3. Step 3: Cross multiply
    682.70x = 942.09 × 387.99
  4. Step 4: Simplify right side
    682.70x = 365,521.50
  5. Step 5: Solve for x
    x = 365,521.50/682.70
  6. Step 6: Final answer
    x = 535.41

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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.