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Finding the Third Proportional to 853.50 and 1,772

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Solution

The third proportional to 853.50 and 1,772 is: 3,678.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.50 : 1,772 = 1,772 : x
  2. Step 2: Convert to fraction form
    853.50/1,772 = 1,772/x
  3. Step 3: Cross multiply
    853.50x = 1,772 × 1,772
  4. Step 4: Simplify right side
    853.50x = 3,139,984
  5. Step 5: Solve for x
    x = 3,139,984/853.50
  6. Step 6: Final answer
    x = 3,678.95

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.