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Finding the Third Proportional to 289.50 and 634.50

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Solution

The third proportional to 289.50 and 634.50 is: 1,390.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.50 : 634.50 = 634.50 : x
  2. Step 2: Convert to fraction form
    289.50/634.50 = 634.50/x
  3. Step 3: Cross multiply
    289.50x = 634.50 × 634.50
  4. Step 4: Simplify right side
    289.50x = 402,590.25
  5. Step 5: Solve for x
    x = 402,590.25/289.50
  6. Step 6: Final answer
    x = 1,390.64

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.