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Finding the Fourth Proportional to 263,610.40, 395,415.60 and 76,640.80

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Solution

The fourth proportional to 263,610.40, 395,415.60 and 76,640.80 is: 114,961.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,610.40 : 395,415.60 = 76,640.80 : x
  2. Step 2: Convert to fraction form
    263,610.40/395,415.60 = 76,640.80/x
  3. Step 3: Cross multiply
    263,610.40x = 395,415.60 × 76,640.80
  4. Step 4: Simplify right side
    263,610.40x = 30,304,967,916.48
  5. Step 5: Solve for x
    x = 30,304,967,916.48/263,610.40
  6. Step 6: Final answer
    x = 114,961.20

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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.