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Finding the Fourth Proportional to 865.11, 1,194.08 and 492.31

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Solution

The fourth proportional to 865.11, 1,194.08 and 492.31 is: 679.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.11 : 1,194.08 = 492.31 : x
  2. Step 2: Convert to fraction form
    865.11/1,194.08 = 492.31/x
  3. Step 3: Cross multiply
    865.11x = 1,194.08 × 492.31
  4. Step 4: Simplify right side
    865.11x = 587,857.52
  5. Step 5: Solve for x
    x = 587,857.52/865.11
  6. Step 6: Final answer
    x = 679.52

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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.