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Finding the Fourth Proportional to 681.39, 940.23 and 386.69

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Solution

The fourth proportional to 681.39, 940.23 and 386.69 is: 533.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.39 : 940.23 = 386.69 : x
  2. Step 2: Convert to fraction form
    681.39/940.23 = 386.69/x
  3. Step 3: Cross multiply
    681.39x = 940.23 × 386.69
  4. Step 4: Simplify right side
    681.39x = 363,572.84
  5. Step 5: Solve for x
    x = 363,572.84/681.39
  6. Step 6: Final answer
    x = 533.58

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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.