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Finding the Third Proportional to 258,710 and 555,220

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Solution

The third proportional to 258,710 and 555,220 is: 1,191,562.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,710 : 555,220 = 555,220 : x
  2. Step 2: Convert to fraction form
    258,710/555,220 = 555,220/x
  3. Step 3: Cross multiply
    258,710x = 555,220 × 555,220
  4. Step 4: Simplify right side
    258,710x = 308,269,248,400
  5. Step 5: Solve for x
    x = 308,269,248,400/258,710
  6. Step 6: Final answer
    x = 1,191,562.94

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.