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Finding the Fourth Proportional to 14.08, 21.08 and 12.88

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Solution

The fourth proportional to 14.08, 21.08 and 12.88 is: 19.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.08 : 21.08 = 12.88 : x
  2. Step 2: Convert to fraction form
    14.08/21.08 = 12.88/x
  3. Step 3: Cross multiply
    14.08x = 21.08 × 12.88
  4. Step 4: Simplify right side
    14.08x = 271.51
  5. Step 5: Solve for x
    x = 271.51/14.08
  6. Step 6: Final answer
    x = 19.28

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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.