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Finding the Fourth Proportional to 19.45, 26.80 and 18.78

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Solution

The fourth proportional to 19.45, 26.80 and 18.78 is: 25.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.45 : 26.80 = 18.78 : x
  2. Step 2: Convert to fraction form
    19.45/26.80 = 18.78/x
  3. Step 3: Cross multiply
    19.45x = 26.80 × 18.78
  4. Step 4: Simplify right side
    19.45x = 503.30
  5. Step 5: Solve for x
    x = 503.30/19.45
  6. Step 6: Final answer
    x = 25.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.