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Finding the Fourth Proportional to 681.08, 939.87 and 386.24

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Solution

The fourth proportional to 681.08, 939.87 and 386.24 is: 533.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.08 : 939.87 = 386.24 : x
  2. Step 2: Convert to fraction form
    681.08/939.87 = 386.24/x
  3. Step 3: Cross multiply
    681.08x = 939.87 × 386.24
  4. Step 4: Simplify right side
    681.08x = 363,010.69
  5. Step 5: Solve for x
    x = 363,010.69/681.08
  6. Step 6: Final answer
    x = 533.00

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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.