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Finding the Third Proportional to 712.50 and 1,085

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Solution

The third proportional to 712.50 and 1,085 is: 1,652.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.50 : 1,085 = 1,085 : x
  2. Step 2: Convert to fraction form
    712.50/1,085 = 1,085/x
  3. Step 3: Cross multiply
    712.50x = 1,085 × 1,085
  4. Step 4: Simplify right side
    712.50x = 1,177,225
  5. Step 5: Solve for x
    x = 1,177,225/712.50
  6. Step 6: Final answer
    x = 1,652.25

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.