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Finding the Fourth Proportional to 420,653.94, 580,553.37 and 239,409.96

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Solution

The fourth proportional to 420,653.94, 580,553.37 and 239,409.96 is: 330,414.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,653.94 : 580,553.37 = 239,409.96 : x
  2. Step 2: Convert to fraction form
    420,653.94/580,553.37 = 239,409.96/x
  3. Step 3: Cross multiply
    420,653.94x = 580,553.37 × 239,409.96
  4. Step 4: Simplify right side
    420,653.94x = 138,990,259,089.57
  5. Step 5: Solve for x
    x = 138,990,259,089.57/420,653.94
  6. Step 6: Final answer
    x = 330,414.73

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1.5x scale

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.