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Finding the Fourth Proportional to 20.94, 28.78 and 18.06

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Solution

The fourth proportional to 20.94, 28.78 and 18.06 is: 24.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.94 : 28.78 = 18.06 : x
  2. Step 2: Convert to fraction form
    20.94/28.78 = 18.06/x
  3. Step 3: Cross multiply
    20.94x = 28.78 × 18.06
  4. Step 4: Simplify right side
    20.94x = 519.77
  5. Step 5: Solve for x
    x = 519.77/20.94
  6. Step 6: Final answer
    x = 24.82

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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.