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Finding the Fourth Proportional to 18, 26.90 and 17.82

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Solution

The fourth proportional to 18, 26.90 and 17.82 is: 26.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18 : 26.90 = 17.82 : x
  2. Step 2: Convert to fraction form
    18/26.90 = 17.82/x
  3. Step 3: Cross multiply
    18x = 26.90 × 17.82
  4. Step 4: Simplify right side
    18x = 479.27
  5. Step 5: Solve for x
    x = 479.27/18
  6. Step 6: Final answer
    x = 26.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.