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Finding the Third Proportional to 252.50 and 678.50

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Solution

The third proportional to 252.50 and 678.50 is: 1,823.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.50 : 678.50 = 678.50 : x
  2. Step 2: Convert to fraction form
    252.50/678.50 = 678.50/x
  3. Step 3: Cross multiply
    252.50x = 678.50 × 678.50
  4. Step 4: Simplify right side
    252.50x = 460,362.25
  5. Step 5: Solve for x
    x = 460,362.25/252.50
  6. Step 6: Final answer
    x = 1,823.22

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Why These Related Problems?

These problems maintain the same ratio (2.69) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.