Home / 420,380.35-630,819.75-393,782.19

Finding the Fourth Proportional to 420,380.35, 630,819.75 and 393,782.19

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Solution

The fourth proportional to 420,380.35, 630,819.75 and 393,782.19 is: 590,906.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,380.35 : 630,819.75 = 393,782.19 : x
  2. Step 2: Convert to fraction form
    420,380.35/630,819.75 = 393,782.19/x
  3. Step 3: Cross multiply
    420,380.35x = 630,819.75 × 393,782.19
  4. Step 4: Simplify right side
    420,380.35x = 248,405,582,650.25
  5. Step 5: Solve for x
    x = 248,405,582,650.25/420,380.35
  6. Step 6: Final answer
    x = 590,906.74

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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.