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Finding the Fourth Proportional to 17.78, 26.64 and 17.31

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Solution

The fourth proportional to 17.78, 26.64 and 17.31 is: 25.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.78 : 26.64 = 17.31 : x
  2. Step 2: Convert to fraction form
    17.78/26.64 = 17.31/x
  3. Step 3: Cross multiply
    17.78x = 26.64 × 17.31
  4. Step 4: Simplify right side
    17.78x = 461.14
  5. Step 5: Solve for x
    x = 461.14/17.78
  6. Step 6: Final answer
    x = 25.94

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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.