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Finding the Fourth Proportional to 858,796.40, 1,288,194.60 and 620,850.80

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Solution

The fourth proportional to 858,796.40, 1,288,194.60 and 620,850.80 is: 931,276.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,796.40 : 1,288,194.60 = 620,850.80 : x
  2. Step 2: Convert to fraction form
    858,796.40/1,288,194.60 = 620,850.80/x
  3. Step 3: Cross multiply
    858,796.40x = 1,288,194.60 × 620,850.80
  4. Step 4: Simplify right side
    858,796.40x = 799,776,647,965.68
  5. Step 5: Solve for x
    x = 799,776,647,965.68/858,796.40
  6. Step 6: Final answer
    x = 931,276.20

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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.