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Finding the Fourth Proportional to 547,786.40, 821,679.60 and 397,320.80

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Solution

The fourth proportional to 547,786.40, 821,679.60 and 397,320.80 is: 595,981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    547,786.40 : 821,679.60 = 397,320.80 : x
  2. Step 2: Convert to fraction form
    547,786.40/821,679.60 = 397,320.80/x
  3. Step 3: Cross multiply
    547,786.40x = 821,679.60 × 397,320.80
  4. Step 4: Simplify right side
    547,786.40x = 326,470,396,015.68
  5. Step 5: Solve for x
    x = 326,470,396,015.68/547,786.40
  6. Step 6: Final answer
    x = 595,981.20

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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.