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Finding the Fourth Proportional to 18.54, 25.45 and 18.31

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Solution

The fourth proportional to 18.54, 25.45 and 18.31 is: 25.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.54 : 25.45 = 18.31 : x
  2. Step 2: Convert to fraction form
    18.54/25.45 = 18.31/x
  3. Step 3: Cross multiply
    18.54x = 25.45 × 18.31
  4. Step 4: Simplify right side
    18.54x = 465.99
  5. Step 5: Solve for x
    x = 465.99/18.54
  6. Step 6: Final answer
    x = 25.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.