Home / 858,809.20-1,288,213.80-438,905.20

Finding the Fourth Proportional to 858,809.20, 1,288,213.80 and 438,905.20

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Solution

The fourth proportional to 858,809.20, 1,288,213.80 and 438,905.20 is: 658,357.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,809.20 : 1,288,213.80 = 438,905.20 : x
  2. Step 2: Convert to fraction form
    858,809.20/1,288,213.80 = 438,905.20/x
  3. Step 3: Cross multiply
    858,809.20x = 1,288,213.80 × 438,905.20
  4. Step 4: Simplify right side
    858,809.20x = 565,403,735,531.76
  5. Step 5: Solve for x
    x = 565,403,735,531.76/858,809.20
  6. Step 6: Final answer
    x = 658,357.80

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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.