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Finding the Fourth Proportional to 19.90, 27.72 and 19.63

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Solution

The fourth proportional to 19.90, 27.72 and 19.63 is: 27.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.90 : 27.72 = 19.63 : x
  2. Step 2: Convert to fraction form
    19.90/27.72 = 19.63/x
  3. Step 3: Cross multiply
    19.90x = 27.72 × 19.63
  4. Step 4: Simplify right side
    19.90x = 544.14
  5. Step 5: Solve for x
    x = 544.14/19.90
  6. Step 6: Final answer
    x = 27.34

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.