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Finding the Fourth Proportional to 520,266.40, 780,399.60 and 394,295.20

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Solution

The fourth proportional to 520,266.40, 780,399.60 and 394,295.20 is: 591,442.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,266.40 : 780,399.60 = 394,295.20 : x
  2. Step 2: Convert to fraction form
    520,266.40/780,399.60 = 394,295.20/x
  3. Step 3: Cross multiply
    520,266.40x = 780,399.60 × 394,295.20
  4. Step 4: Simplify right side
    520,266.40x = 307,707,816,361.92
  5. Step 5: Solve for x
    x = 307,707,816,361.92/520,266.40
  6. Step 6: Final answer
    x = 591,442.80

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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.