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Finding the Third Proportional to 216.56 and 319.13

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Solution

The third proportional to 216.56 and 319.13 is: 470.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.56 : 319.13 = 319.13 : x
  2. Step 2: Convert to fraction form
    216.56/319.13 = 319.13/x
  3. Step 3: Cross multiply
    216.56x = 319.13 × 319.13
  4. Step 4: Simplify right side
    216.56x = 101,840.77
  5. Step 5: Solve for x
    x = 101,840.77/216.56
  6. Step 6: Final answer
    x = 470.26

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.