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Finding the Fourth Proportional to 420,571.34, 580,380.90 and 239,279.37

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Solution

The fourth proportional to 420,571.34, 580,380.90 and 239,279.37 is: 330,201.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,571.34 : 580,380.90 = 239,279.37 : x
  2. Step 2: Convert to fraction form
    420,571.34/580,380.90 = 239,279.37/x
  3. Step 3: Cross multiply
    420,571.34x = 580,380.90 × 239,279.37
  4. Step 4: Simplify right side
    420,571.34x = 138,873,173,038.31
  5. Step 5: Solve for x
    x = 138,873,173,038.31/420,571.34
  6. Step 6: Final answer
    x = 330,201.23

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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.