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Finding the Fourth Proportional to 14.06, 20.96 and 12.80

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Solution

The fourth proportional to 14.06, 20.96 and 12.80 is: 19.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.06 : 20.96 = 12.80 : x
  2. Step 2: Convert to fraction form
    14.06/20.96 = 12.80/x
  3. Step 3: Cross multiply
    14.06x = 20.96 × 12.80
  4. Step 4: Simplify right side
    14.06x = 268.29
  5. Step 5: Solve for x
    x = 268.29/14.06
  6. Step 6: Final answer
    x = 19.08

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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.