Home / 425,986.20-639,497.70-215,515.80

Finding the Fourth Proportional to 425,986.20, 639,497.70 and 215,515.80

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Solution

The fourth proportional to 425,986.20, 639,497.70 and 215,515.80 is: 323,535.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,986.20 : 639,497.70 = 215,515.80 : x
  2. Step 2: Convert to fraction form
    425,986.20/639,497.70 = 215,515.80/x
  3. Step 3: Cross multiply
    425,986.20x = 639,497.70 × 215,515.80
  4. Step 4: Simplify right side
    425,986.20x = 137,821,858,413.66
  5. Step 5: Solve for x
    x = 137,821,858,413.66/425,986.20
  6. Step 6: Final answer
    x = 323,535.97

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1.5x scale

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.