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Finding the Fourth Proportional to 14.15, 21.08 and 12.74

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Solution

The fourth proportional to 14.15, 21.08 and 12.74 is: 18.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.15 : 21.08 = 12.74 : x
  2. Step 2: Convert to fraction form
    14.15/21.08 = 12.74/x
  3. Step 3: Cross multiply
    14.15x = 21.08 × 12.74
  4. Step 4: Simplify right side
    14.15x = 268.49
  5. Step 5: Solve for x
    x = 268.49/14.15
  6. Step 6: Final answer
    x = 18.97

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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.