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Finding the Third Proportional to 290.50 and 445

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Solution

The third proportional to 290.50 and 445 is: 681.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.50 : 445 = 445 : x
  2. Step 2: Convert to fraction form
    290.50/445 = 445/x
  3. Step 3: Cross multiply
    290.50x = 445 × 445
  4. Step 4: Simplify right side
    290.50x = 198,025
  5. Step 5: Solve for x
    x = 198,025/290.50
  6. Step 6: Final answer
    x = 681.67

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.