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Finding the Fourth Proportional to 19.36, 29.22 and 18.72

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Solution

The fourth proportional to 19.36, 29.22 and 18.72 is: 28.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.36 : 29.22 = 18.72 : x
  2. Step 2: Convert to fraction form
    19.36/29.22 = 18.72/x
  3. Step 3: Cross multiply
    19.36x = 29.22 × 18.72
  4. Step 4: Simplify right side
    19.36x = 547.00
  5. Step 5: Solve for x
    x = 547.00/19.36
  6. Step 6: Final answer
    x = 28.25

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.