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Finding the Fourth Proportional to 19.91, 29.72 and 17.63

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Solution

The fourth proportional to 19.91, 29.72 and 17.63 is: 26.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.91 : 29.72 = 17.63 : x
  2. Step 2: Convert to fraction form
    19.91/29.72 = 17.63/x
  3. Step 3: Cross multiply
    19.91x = 29.72 × 17.63
  4. Step 4: Simplify right side
    19.91x = 523.96
  5. Step 5: Solve for x
    x = 523.96/19.91
  6. Step 6: Final answer
    x = 26.32

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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.