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Finding the Third Proportional to 13.15 and 19.20

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Solution

The third proportional to 13.15 and 19.20 is: 28.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.15 : 19.20 = 19.20 : x
  2. Step 2: Convert to fraction form
    13.15/19.20 = 19.20/x
  3. Step 3: Cross multiply
    13.15x = 19.20 × 19.20
  4. Step 4: Simplify right side
    13.15x = 368.46
  5. Step 5: Solve for x
    x = 368.46/13.15
  6. Step 6: Final answer
    x = 28.02

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.