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Finding the Fourth Proportional to 681.62, 940.63 and 386.89

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Solution

The fourth proportional to 681.62, 940.63 and 386.89 is: 533.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.62 : 940.63 = 386.89 : x
  2. Step 2: Convert to fraction form
    681.62/940.63 = 386.89/x
  3. Step 3: Cross multiply
    681.62x = 940.63 × 386.89
  4. Step 4: Simplify right side
    681.62x = 363,920.15
  5. Step 5: Solve for x
    x = 363,920.15/681.62
  6. Step 6: Final answer
    x = 533.91

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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.