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Finding the Third Proportional to 678 and 972

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Solution

The third proportional to 678 and 972 is: 1,393.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    678 : 972 = 972 : x
  2. Step 2: Convert to fraction form
    678/972 = 972/x
  3. Step 3: Cross multiply
    678x = 972 × 972
  4. Step 4: Simplify right side
    678x = 944,784
  5. Step 5: Solve for x
    x = 944,784/678
  6. Step 6: Final answer
    x = 1,393.49

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.