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Finding the Fourth Proportional to 420,687.87, 580,556.75 and 239,380.71

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Solution

The fourth proportional to 420,687.87, 580,556.75 and 239,380.71 is: 330,349.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,687.87 : 580,556.75 = 239,380.71 : x
  2. Step 2: Convert to fraction form
    420,687.87/580,556.75 = 239,380.71/x
  3. Step 3: Cross multiply
    420,687.87x = 580,556.75 × 239,380.71
  4. Step 4: Simplify right side
    420,687.87x = 138,974,085,813.39
  5. Step 5: Solve for x
    x = 138,974,085,813.39/420,687.87
  6. Step 6: Final answer
    x = 330,349.64

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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.