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Finding the Fourth Proportional to 19.91, 30.04 and 19.64

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Solution

The fourth proportional to 19.91, 30.04 and 19.64 is: 29.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.91 : 30.04 = 19.64 : x
  2. Step 2: Convert to fraction form
    19.91/30.04 = 19.64/x
  3. Step 3: Cross multiply
    19.91x = 30.04 × 19.64
  4. Step 4: Simplify right side
    19.91x = 590.01
  5. Step 5: Solve for x
    x = 590.01/19.91
  6. Step 6: Final answer
    x = 29.63

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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.