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Finding the Fourth Proportional to 19.42, 26.76 and 18.80

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Solution

The fourth proportional to 19.42, 26.76 and 18.80 is: 25.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.42 : 26.76 = 18.80 : x
  2. Step 2: Convert to fraction form
    19.42/26.76 = 18.80/x
  3. Step 3: Cross multiply
    19.42x = 26.76 × 18.80
  4. Step 4: Simplify right side
    19.42x = 503.09
  5. Step 5: Solve for x
    x = 503.09/19.42
  6. Step 6: Final answer
    x = 25.91

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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.