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Finding the Fourth Proportional to 681.47, 940.28 and 386.66

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Solution

The fourth proportional to 681.47, 940.28 and 386.66 is: 533.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.47 : 940.28 = 386.66 : x
  2. Step 2: Convert to fraction form
    681.47/940.28 = 386.66/x
  3. Step 3: Cross multiply
    681.47x = 940.28 × 386.66
  4. Step 4: Simplify right side
    681.47x = 363,564.93
  5. Step 5: Solve for x
    x = 363,564.93/681.47
  6. Step 6: Final answer
    x = 533.50

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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.