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Finding the Fourth Proportional to 681.14, 939.56 and 386.35

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Solution

The fourth proportional to 681.14, 939.56 and 386.35 is: 532.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.14 : 939.56 = 386.35 : x
  2. Step 2: Convert to fraction form
    681.14/939.56 = 386.35/x
  3. Step 3: Cross multiply
    681.14x = 939.56 × 386.35
  4. Step 4: Simplify right side
    681.14x = 362,994.73
  5. Step 5: Solve for x
    x = 362,994.73/681.14
  6. Step 6: Final answer
    x = 532.92

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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.