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Finding the Fourth Proportional to 18.43, 25.42 and 10.65

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Solution

The fourth proportional to 18.43, 25.42 and 10.65 is: 14.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.43 : 25.42 = 10.65 : x
  2. Step 2: Convert to fraction form
    18.43/25.42 = 10.65/x
  3. Step 3: Cross multiply
    18.43x = 25.42 × 10.65
  4. Step 4: Simplify right side
    18.43x = 270.72
  5. Step 5: Solve for x
    x = 270.72/18.43
  6. Step 6: Final answer
    x = 14.69

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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.