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Finding the Third Proportional to 288.75 and 618.25

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Solution

The third proportional to 288.75 and 618.25 is: 1,323.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.75 : 618.25 = 618.25 : x
  2. Step 2: Convert to fraction form
    288.75/618.25 = 618.25/x
  3. Step 3: Cross multiply
    288.75x = 618.25 × 618.25
  4. Step 4: Simplify right side
    288.75x = 382,233.06
  5. Step 5: Solve for x
    x = 382,233.06/288.75
  6. Step 6: Final answer
    x = 1,323.75

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.