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Finding the Third Proportional to 7 and 19.50

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Solution

The third proportional to 7 and 19.50 is: 54.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    7 : 19.50 = 19.50 : x
  2. Step 2: Convert to fraction form
    7/19.50 = 19.50/x
  3. Step 3: Cross multiply
    7x = 19.50 × 19.50
  4. Step 4: Simplify right side
    7x = 380.25
  5. Step 5: Solve for x
    x = 380.25/7
  6. Step 6: Final answer
    x = 54.32

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Why These Related Problems?

These problems maintain the same ratio (2.79) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.