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Finding the Fourth Proportional to 19.31, 28.91 and 14.48

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Solution

The fourth proportional to 19.31, 28.91 and 14.48 is: 21.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.31 : 28.91 = 14.48 : x
  2. Step 2: Convert to fraction form
    19.31/28.91 = 14.48/x
  3. Step 3: Cross multiply
    19.31x = 28.91 × 14.48
  4. Step 4: Simplify right side
    19.31x = 418.40
  5. Step 5: Solve for x
    x = 418.40/19.31
  6. Step 6: Final answer
    x = 21.67

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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.