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Finding the Third Proportional to 419.75 and 666.88

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Solution

The third proportional to 419.75 and 666.88 is: 1,059.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.75 : 666.88 = 666.88 : x
  2. Step 2: Convert to fraction form
    419.75/666.88 = 666.88/x
  3. Step 3: Cross multiply
    419.75x = 666.88 × 666.88
  4. Step 4: Simplify right side
    419.75x = 444,722.27
  5. Step 5: Solve for x
    x = 444,722.27/419.75
  6. Step 6: Final answer
    x = 1,059.49

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.