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Finding the Fourth Proportional to 839.08, 1,252.97 and 685.31

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Solution

The fourth proportional to 839.08, 1,252.97 and 685.31 is: 1,023.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.08 : 1,252.97 = 685.31 : x
  2. Step 2: Convert to fraction form
    839.08/1,252.97 = 685.31/x
  3. Step 3: Cross multiply
    839.08x = 1,252.97 × 685.31
  4. Step 4: Simplify right side
    839.08x = 858,663.18
  5. Step 5: Solve for x
    x = 858,663.18/839.08
  6. Step 6: Final answer
    x = 1,023.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.