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Finding the Fourth Proportional to 680,606.80, 1,020,910.20 and 396,005.20

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Solution

The fourth proportional to 680,606.80, 1,020,910.20 and 396,005.20 is: 594,007.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,606.80 : 1,020,910.20 = 396,005.20 : x
  2. Step 2: Convert to fraction form
    680,606.80/1,020,910.20 = 396,005.20/x
  3. Step 3: Cross multiply
    680,606.80x = 1,020,910.20 × 396,005.20
  4. Step 4: Simplify right side
    680,606.80x = 404,285,747,933.04
  5. Step 5: Solve for x
    x = 404,285,747,933.04/680,606.80
  6. Step 6: Final answer
    x = 594,007.80

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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.