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Finding the Fourth Proportional to 680.31, 938.84 and 369.81

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Solution

The fourth proportional to 680.31, 938.84 and 369.81 is: 510.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.31 : 938.84 = 369.81 : x
  2. Step 2: Convert to fraction form
    680.31/938.84 = 369.81/x
  3. Step 3: Cross multiply
    680.31x = 938.84 × 369.81
  4. Step 4: Simplify right side
    680.31x = 347,192.92
  5. Step 5: Solve for x
    x = 347,192.92/680.31
  6. Step 6: Final answer
    x = 510.34

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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.