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Finding the Fourth Proportional to 17.81, 26.76 and 12.78

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Solution

The fourth proportional to 17.81, 26.76 and 12.78 is: 19.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.81 : 26.76 = 12.78 : x
  2. Step 2: Convert to fraction form
    17.81/26.76 = 12.78/x
  3. Step 3: Cross multiply
    17.81x = 26.76 × 12.78
  4. Step 4: Simplify right side
    17.81x = 341.99
  5. Step 5: Solve for x
    x = 341.99/17.81
  6. Step 6: Final answer
    x = 19.21

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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.