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Finding the Fourth Proportional to 681.45, 940.25 and 386.69

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Solution

The fourth proportional to 681.45, 940.25 and 386.69 is: 533.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.45 : 940.25 = 386.69 : x
  2. Step 2: Convert to fraction form
    681.45/940.25 = 386.69/x
  3. Step 3: Cross multiply
    681.45x = 940.25 × 386.69
  4. Step 4: Simplify right side
    681.45x = 363,578.64
  5. Step 5: Solve for x
    x = 363,578.64/681.45
  6. Step 6: Final answer
    x = 533.54

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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.