Home / 420,821.20-631,231.80-263,357.20

Finding the Fourth Proportional to 420,821.20, 631,231.80 and 263,357.20

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Solution

The fourth proportional to 420,821.20, 631,231.80 and 263,357.20 is: 395,035.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,821.20 : 631,231.80 = 263,357.20 : x
  2. Step 2: Convert to fraction form
    420,821.20/631,231.80 = 263,357.20/x
  3. Step 3: Cross multiply
    420,821.20x = 631,231.80 × 263,357.20
  4. Step 4: Simplify right side
    420,821.20x = 166,239,439,398.96
  5. Step 5: Solve for x
    x = 166,239,439,398.96/420,821.20
  6. Step 6: Final answer
    x = 395,035.80

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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.