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Finding the Fourth Proportional to 18.76, 28.03 and 17.78

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Solution

The fourth proportional to 18.76, 28.03 and 17.78 is: 26.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.76 : 28.03 = 17.78 : x
  2. Step 2: Convert to fraction form
    18.76/28.03 = 17.78/x
  3. Step 3: Cross multiply
    18.76x = 28.03 × 17.78
  4. Step 4: Simplify right side
    18.76x = 498.37
  5. Step 5: Solve for x
    x = 498.37/18.76
  6. Step 6: Final answer
    x = 26.57

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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.