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Finding the Fourth Proportional to 270,361.26, 405,290.88 and 128,273.31

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Solution

The fourth proportional to 270,361.26, 405,290.88 and 128,273.31 is: 192,290.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    270,361.26 : 405,290.88 = 128,273.31 : x
  2. Step 2: Convert to fraction form
    270,361.26/405,290.88 = 128,273.31/x
  3. Step 3: Cross multiply
    270,361.26x = 405,290.88 × 128,273.31
  4. Step 4: Simplify right side
    270,361.26x = 51,988,002,690.41
  5. Step 5: Solve for x
    x = 51,988,002,690.41/270,361.26
  6. Step 6: Final answer
    x = 192,290.87

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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.