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Finding the Third Proportional to 298 and 438

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Solution

The third proportional to 298 and 438 is: 643.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    298 : 438 = 438 : x
  2. Step 2: Convert to fraction form
    298/438 = 438/x
  3. Step 3: Cross multiply
    298x = 438 × 438
  4. Step 4: Simplify right side
    298x = 191,844
  5. Step 5: Solve for x
    x = 191,844/298
  6. Step 6: Final answer
    x = 643.77

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These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.