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Finding the Fourth Proportional to 681.20, 940.14 and 386.49

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Solution

The fourth proportional to 681.20, 940.14 and 386.49 is: 533.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.20 : 940.14 = 386.49 : x
  2. Step 2: Convert to fraction form
    681.20/940.14 = 386.49/x
  3. Step 3: Cross multiply
    681.20x = 940.14 × 386.49
  4. Step 4: Simplify right side
    681.20x = 363,354.71
  5. Step 5: Solve for x
    x = 363,354.71/681.20
  6. Step 6: Final answer
    x = 533.41

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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.