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Finding the Fourth Proportional to 839.11, 1,259.35 and 406.27

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Solution

The fourth proportional to 839.11, 1,259.35 and 406.27 is: 609.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.11 : 1,259.35 = 406.27 : x
  2. Step 2: Convert to fraction form
    839.11/1,259.35 = 406.27/x
  3. Step 3: Cross multiply
    839.11x = 1,259.35 × 406.27
  4. Step 4: Simplify right side
    839.11x = 511,629.60
  5. Step 5: Solve for x
    x = 511,629.60/839.11
  6. Step 6: Final answer
    x = 609.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.