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Finding the Fourth Proportional to 19.42, 26.79 and 12.86

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Solution

The fourth proportional to 19.42, 26.79 and 12.86 is: 17.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.42 : 26.79 = 12.86 : x
  2. Step 2: Convert to fraction form
    19.42/26.79 = 12.86/x
  3. Step 3: Cross multiply
    19.42x = 26.79 × 12.86
  4. Step 4: Simplify right side
    19.42x = 344.52
  5. Step 5: Solve for x
    x = 344.52/19.42
  6. Step 6: Final answer
    x = 17.74

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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.