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Finding the Third Proportional to 309 and 631.50

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Solution

The third proportional to 309 and 631.50 is: 1,290.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    309 : 631.50 = 631.50 : x
  2. Step 2: Convert to fraction form
    309/631.50 = 631.50/x
  3. Step 3: Cross multiply
    309x = 631.50 × 631.50
  4. Step 4: Simplify right side
    309x = 398,792.25
  5. Step 5: Solve for x
    x = 398,792.25/309
  6. Step 6: Final answer
    x = 1,290.59

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.