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Finding the Fourth Proportional to 13.75, 20.64 and 12.90

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Solution

The fourth proportional to 13.75, 20.64 and 12.90 is: 19.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.75 : 20.64 = 12.90 : x
  2. Step 2: Convert to fraction form
    13.75/20.64 = 12.90/x
  3. Step 3: Cross multiply
    13.75x = 20.64 × 12.90
  4. Step 4: Simplify right side
    13.75x = 266.26
  5. Step 5: Solve for x
    x = 266.26/13.75
  6. Step 6: Final answer
    x = 19.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.