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Finding the Fourth Proportional to 681.03, 939.82 and 386.35

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Solution

The fourth proportional to 681.03, 939.82 and 386.35 is: 533.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.03 : 939.82 = 386.35 : x
  2. Step 2: Convert to fraction form
    681.03/939.82 = 386.35/x
  3. Step 3: Cross multiply
    681.03x = 939.82 × 386.35
  4. Step 4: Simplify right side
    681.03x = 363,099.46
  5. Step 5: Solve for x
    x = 363,099.46/681.03
  6. Step 6: Final answer
    x = 533.16

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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.