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Finding the Third Proportional to 218,700 and 279,450

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Solution

The third proportional to 218,700 and 279,450 is: 357,075

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,700 : 279,450 = 279,450 : x
  2. Step 2: Convert to fraction form
    218,700/279,450 = 279,450/x
  3. Step 3: Cross multiply
    218,700x = 279,450 × 279,450
  4. Step 4: Simplify right side
    218,700x = 78,092,302,500
  5. Step 5: Solve for x
    x = 78,092,302,500/218,700
  6. Step 6: Final answer
    x = 357,075

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.