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Finding the Fourth Proportional to 512,156.40, 768,234.60 and 485,912.40

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Solution

The fourth proportional to 512,156.40, 768,234.60 and 485,912.40 is: 728,868.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    512,156.40 : 768,234.60 = 485,912.40 : x
  2. Step 2: Convert to fraction form
    512,156.40/768,234.60 = 485,912.40/x
  3. Step 3: Cross multiply
    512,156.40x = 768,234.60 × 485,912.40
  4. Step 4: Simplify right side
    512,156.40x = 373,294,718,249.04
  5. Step 5: Solve for x
    x = 373,294,718,249.04/512,156.40
  6. Step 6: Final answer
    x = 728,868.60

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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.