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Finding the Fourth Proportional to 18.70, 25.78 and 13.86

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Solution

The fourth proportional to 18.70, 25.78 and 13.86 is: 19.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.70 : 25.78 = 13.86 : x
  2. Step 2: Convert to fraction form
    18.70/25.78 = 13.86/x
  3. Step 3: Cross multiply
    18.70x = 25.78 × 13.86
  4. Step 4: Simplify right side
    18.70x = 357.31
  5. Step 5: Solve for x
    x = 357.31/18.70
  6. Step 6: Final answer
    x = 19.11

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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.