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Finding the Third Proportional to 216.24 and 309.95

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Solution

The third proportional to 216.24 and 309.95 is: 444.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.24 : 309.95 = 309.95 : x
  2. Step 2: Convert to fraction form
    216.24/309.95 = 309.95/x
  3. Step 3: Cross multiply
    216.24x = 309.95 × 309.95
  4. Step 4: Simplify right side
    216.24x = 96,068.75
  5. Step 5: Solve for x
    x = 96,068.75/216.24
  6. Step 6: Final answer
    x = 444.26

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.