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Finding the Fourth Proportional to 18.74, 28.07 and 12.95

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Solution

The fourth proportional to 18.74, 28.07 and 12.95 is: 19.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.74 : 28.07 = 12.95 : x
  2. Step 2: Convert to fraction form
    18.74/28.07 = 12.95/x
  3. Step 3: Cross multiply
    18.74x = 28.07 × 12.95
  4. Step 4: Simplify right side
    18.74x = 363.51
  5. Step 5: Solve for x
    x = 363.51/18.74
  6. Step 6: Final answer
    x = 19.40

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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.