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Finding the Fourth Proportional to 290,732.20, 436,040.70 and 140,972.20

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Solution

The fourth proportional to 290,732.20, 436,040.70 and 140,972.20 is: 211,430.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,732.20 : 436,040.70 = 140,972.20 : x
  2. Step 2: Convert to fraction form
    290,732.20/436,040.70 = 140,972.20/x
  3. Step 3: Cross multiply
    290,732.20x = 436,040.70 × 140,972.20
  4. Step 4: Simplify right side
    290,732.20x = 61,469,616,768.54
  5. Step 5: Solve for x
    x = 61,469,616,768.54/290,732.20
  6. Step 6: Final answer
    x = 211,430.37

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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.