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Finding the Fourth Proportional to 681.69, 940.74 and 386.98

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Solution

The fourth proportional to 681.69, 940.74 and 386.98 is: 534.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.69 : 940.74 = 386.98 : x
  2. Step 2: Convert to fraction form
    681.69/940.74 = 386.98/x
  3. Step 3: Cross multiply
    681.69x = 940.74 × 386.98
  4. Step 4: Simplify right side
    681.69x = 364,044.85
  5. Step 5: Solve for x
    x = 364,044.85/681.69
  6. Step 6: Final answer
    x = 534.03

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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.