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Finding the Fourth Proportional to 290,916.72, 401,469.12 and 218,191.68

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Solution

The fourth proportional to 290,916.72, 401,469.12 and 218,191.68 is: 301,107.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,916.72 : 401,469.12 = 218,191.68 : x
  2. Step 2: Convert to fraction form
    290,916.72/401,469.12 = 218,191.68/x
  3. Step 3: Cross multiply
    290,916.72x = 401,469.12 × 218,191.68
  4. Step 4: Simplify right side
    290,916.72x = 87,597,221,760.92
  5. Step 5: Solve for x
    x = 87,597,221,760.92/290,916.72
  6. Step 6: Final answer
    x = 301,107.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.