Home / 685,778.43-946,389.60-391,422.30

Finding the Fourth Proportional to 685,778.43, 946,389.60 and 391,422.30

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Solution

The fourth proportional to 685,778.43, 946,389.60 and 391,422.30 is: 540,171.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,778.43 : 946,389.60 = 391,422.30 : x
  2. Step 2: Convert to fraction form
    685,778.43/946,389.60 = 391,422.30/x
  3. Step 3: Cross multiply
    685,778.43x = 946,389.60 × 391,422.30
  4. Step 4: Simplify right side
    685,778.43x = 370,437,993,928.08
  5. Step 5: Solve for x
    x = 370,437,993,928.08/685,778.43
  6. Step 6: Final answer
    x = 540,171.54

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.