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Finding the Fourth Proportional to 18.39, 27.72 and 17.64

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Solution

The fourth proportional to 18.39, 27.72 and 17.64 is: 26.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.39 : 27.72 = 17.64 : x
  2. Step 2: Convert to fraction form
    18.39/27.72 = 17.64/x
  3. Step 3: Cross multiply
    18.39x = 27.72 × 17.64
  4. Step 4: Simplify right side
    18.39x = 488.98
  5. Step 5: Solve for x
    x = 488.98/18.39
  6. Step 6: Final answer
    x = 26.59

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.