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Finding the Fourth Proportional to 13.15, 19.61 and 12.99

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Solution

The fourth proportional to 13.15, 19.61 and 12.99 is: 19.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.15 : 19.61 = 12.99 : x
  2. Step 2: Convert to fraction form
    13.15/19.61 = 12.99/x
  3. Step 3: Cross multiply
    13.15x = 19.61 × 12.99
  4. Step 4: Simplify right side
    13.15x = 254.73
  5. Step 5: Solve for x
    x = 254.73/13.15
  6. Step 6: Final answer
    x = 19.37

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.