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Finding the Fourth Proportional to 863,138.40, 1,294,189.20 and 443,234.40

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Solution

The fourth proportional to 863,138.40, 1,294,189.20 and 443,234.40 is: 664,585.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    863,138.40 : 1,294,189.20 = 443,234.40 : x
  2. Step 2: Convert to fraction form
    863,138.40/1,294,189.20 = 443,234.40/x
  3. Step 3: Cross multiply
    863,138.40x = 1,294,189.20 × 443,234.40
  4. Step 4: Simplify right side
    863,138.40x = 573,629,173,548.48
  5. Step 5: Solve for x
    x = 573,629,173,548.48/863,138.40
  6. Step 6: Final answer
    x = 664,585.39

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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.