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Finding the Fourth Proportional to 19.63, 29.36 and 13.21

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Solution

The fourth proportional to 19.63, 29.36 and 13.21 is: 19.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.63 : 29.36 = 13.21 : x
  2. Step 2: Convert to fraction form
    19.63/29.36 = 13.21/x
  3. Step 3: Cross multiply
    19.63x = 29.36 × 13.21
  4. Step 4: Simplify right side
    19.63x = 387.97
  5. Step 5: Solve for x
    x = 387.97/19.63
  6. Step 6: Final answer
    x = 19.77

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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.