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Finding the Third Proportional to 398,424 and 863,220

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Solution

The third proportional to 398,424 and 863,220 is: 1,870,240.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,424 : 863,220 = 863,220 : x
  2. Step 2: Convert to fraction form
    398,424/863,220 = 863,220/x
  3. Step 3: Cross multiply
    398,424x = 863,220 × 863,220
  4. Step 4: Simplify right side
    398,424x = 745,148,768,400
  5. Step 5: Solve for x
    x = 745,148,768,400/398,424
  6. Step 6: Final answer
    x = 1,870,240.67

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.