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Finding the Fourth Proportional to 290,998.72, 436,504.92 and 80,638.48

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Solution

The fourth proportional to 290,998.72, 436,504.92 and 80,638.48 is: 120,959.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,998.72 : 436,504.92 = 80,638.48 : x
  2. Step 2: Convert to fraction form
    290,998.72/436,504.92 = 80,638.48/x
  3. Step 3: Cross multiply
    290,998.72x = 436,504.92 × 80,638.48
  4. Step 4: Simplify right side
    290,998.72x = 35,199,093,261.32
  5. Step 5: Solve for x
    x = 35,199,093,261.32/290,998.72
  6. Step 6: Final answer
    x = 120,959.62

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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.