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Finding the Third Proportional to 217.50 and 459.50

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Solution

The third proportional to 217.50 and 459.50 is: 970.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.50 : 459.50 = 459.50 : x
  2. Step 2: Convert to fraction form
    217.50/459.50 = 459.50/x
  3. Step 3: Cross multiply
    217.50x = 459.50 × 459.50
  4. Step 4: Simplify right side
    217.50x = 211,140.25
  5. Step 5: Solve for x
    x = 211,140.25/217.50
  6. Step 6: Final answer
    x = 970.76

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.