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Finding the Third Proportional to 357.75 and 420.75

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Solution

The third proportional to 357.75 and 420.75 is: 494.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.75 : 420.75 = 420.75 : x
  2. Step 2: Convert to fraction form
    357.75/420.75 = 420.75/x
  3. Step 3: Cross multiply
    357.75x = 420.75 × 420.75
  4. Step 4: Simplify right side
    357.75x = 177,030.56
  5. Step 5: Solve for x
    x = 177,030.56/357.75
  6. Step 6: Final answer
    x = 494.84

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.