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Finding the Fourth Proportional to 680.82, 939.54 and 386.19

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Solution

The fourth proportional to 680.82, 939.54 and 386.19 is: 532.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.82 : 939.54 = 386.19 : x
  2. Step 2: Convert to fraction form
    680.82/939.54 = 386.19/x
  3. Step 3: Cross multiply
    680.82x = 939.54 × 386.19
  4. Step 4: Simplify right side
    680.82x = 362,840.95
  5. Step 5: Solve for x
    x = 362,840.95/680.82
  6. Step 6: Final answer
    x = 532.95

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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.