Home / 420,136.60-628,856.10-220,171.80

Finding the Fourth Proportional to 420,136.60, 628,856.10 and 220,171.80

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Solution

The fourth proportional to 420,136.60, 628,856.10 and 220,171.80 is: 329,550.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,136.60 : 628,856.10 = 220,171.80 : x
  2. Step 2: Convert to fraction form
    420,136.60/628,856.10 = 220,171.80/x
  3. Step 3: Cross multiply
    420,136.60x = 628,856.10 × 220,171.80
  4. Step 4: Simplify right side
    420,136.60x = 138,456,379,477.98
  5. Step 5: Solve for x
    x = 138,456,379,477.98/420,136.60
  6. Step 6: Final answer
    x = 329,550.86

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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.