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Finding the Third Proportional to 287.50 and 756.25

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Solution

The third proportional to 287.50 and 756.25 is: 1,989.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.50 : 756.25 = 756.25 : x
  2. Step 2: Convert to fraction form
    287.50/756.25 = 756.25/x
  3. Step 3: Cross multiply
    287.50x = 756.25 × 756.25
  4. Step 4: Simplify right side
    287.50x = 571,914.06
  5. Step 5: Solve for x
    x = 571,914.06/287.50
  6. Step 6: Final answer
    x = 1,989.27

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Why These Related Problems?

These problems maintain the same ratio (2.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.