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Finding the Third Proportional to 255,772 and 401,220

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Solution

The third proportional to 255,772 and 401,220 is: 629,378.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,772 : 401,220 = 401,220 : x
  2. Step 2: Convert to fraction form
    255,772/401,220 = 401,220/x
  3. Step 3: Cross multiply
    255,772x = 401,220 × 401,220
  4. Step 4: Simplify right side
    255,772x = 160,977,488,400
  5. Step 5: Solve for x
    x = 160,977,488,400/255,772
  6. Step 6: Final answer
    x = 629,378.85

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.