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Finding the Fourth Proportional to 680.73, 939.39 and 386.04

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Solution

The fourth proportional to 680.73, 939.39 and 386.04 is: 532.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.73 : 939.39 = 386.04 : x
  2. Step 2: Convert to fraction form
    680.73/939.39 = 386.04/x
  3. Step 3: Cross multiply
    680.73x = 939.39 × 386.04
  4. Step 4: Simplify right side
    680.73x = 362,642.12
  5. Step 5: Solve for x
    x = 362,642.12/680.73
  6. Step 6: Final answer
    x = 532.73

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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.