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Finding the Fourth Proportional to 681.76, 940.71 and 386.92

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Solution

The fourth proportional to 681.76, 940.71 and 386.92 is: 533.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.76 : 940.71 = 386.92 : x
  2. Step 2: Convert to fraction form
    681.76/940.71 = 386.92/x
  3. Step 3: Cross multiply
    681.76x = 940.71 × 386.92
  4. Step 4: Simplify right side
    681.76x = 363,979.51
  5. Step 5: Solve for x
    x = 363,979.51/681.76
  6. Step 6: Final answer
    x = 533.88

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1.5x scale

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.