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Finding the Fourth Proportional to 23.15, 34.63 and 18.90

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Solution

The fourth proportional to 23.15, 34.63 and 18.90 is: 28.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.15 : 34.63 = 18.90 : x
  2. Step 2: Convert to fraction form
    23.15/34.63 = 18.90/x
  3. Step 3: Cross multiply
    23.15x = 34.63 × 18.90
  4. Step 4: Simplify right side
    23.15x = 654.46
  5. Step 5: Solve for x
    x = 654.46/23.15
  6. Step 6: Final answer
    x = 28.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.