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Finding the Third Proportional to 290.50 and 411

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Solution

The third proportional to 290.50 and 411 is: 581.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.50 : 411 = 411 : x
  2. Step 2: Convert to fraction form
    290.50/411 = 411/x
  3. Step 3: Cross multiply
    290.50x = 411 × 411
  4. Step 4: Simplify right side
    290.50x = 168,921
  5. Step 5: Solve for x
    x = 168,921/290.50
  6. Step 6: Final answer
    x = 581.48

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.