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Finding the Third Proportional to 216.56 and 290.25

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Solution

The third proportional to 216.56 and 290.25 is: 389.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.56 : 290.25 = 290.25 : x
  2. Step 2: Convert to fraction form
    216.56/290.25 = 290.25/x
  3. Step 3: Cross multiply
    216.56x = 290.25 × 290.25
  4. Step 4: Simplify right side
    216.56x = 84,245.06
  5. Step 5: Solve for x
    x = 84,245.06/216.56
  6. Step 6: Final answer
    x = 389.01

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.