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Finding the Fourth Proportional to 14.56, 21.86 and 12.31

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Solution

The fourth proportional to 14.56, 21.86 and 12.31 is: 18.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.56 : 21.86 = 12.31 : x
  2. Step 2: Convert to fraction form
    14.56/21.86 = 12.31/x
  3. Step 3: Cross multiply
    14.56x = 21.86 × 12.31
  4. Step 4: Simplify right side
    14.56x = 269.04
  5. Step 5: Solve for x
    x = 269.04/14.56
  6. Step 6: Final answer
    x = 18.48

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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.