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Finding the Third Proportional to 668.75 and 719.75

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Solution

The third proportional to 668.75 and 719.75 is: 774.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.75 : 719.75 = 719.75 : x
  2. Step 2: Convert to fraction form
    668.75/719.75 = 719.75/x
  3. Step 3: Cross multiply
    668.75x = 719.75 × 719.75
  4. Step 4: Simplify right side
    668.75x = 518,040.06
  5. Step 5: Solve for x
    x = 518,040.06/668.75
  6. Step 6: Final answer
    x = 774.64

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.