Home / 780,057.45-1,170,086.18-638,339.85

Finding the Fourth Proportional to 780,057.45, 1,170,086.18 and 638,339.85

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Solution

The fourth proportional to 780,057.45, 1,170,086.18 and 638,339.85 is: 957,509.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,057.45 : 1,170,086.18 = 638,339.85 : x
  2. Step 2: Convert to fraction form
    780,057.45/1,170,086.18 = 638,339.85/x
  3. Step 3: Cross multiply
    780,057.45x = 1,170,086.18 × 638,339.85
  4. Step 4: Simplify right side
    780,057.45x = 746,912,633,436.57
  5. Step 5: Solve for x
    x = 746,912,633,436.57/780,057.45
  6. Step 6: Final answer
    x = 957,509.78

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Double scale
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Similar ratio
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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.