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Finding the Fourth Proportional to 9.78, 13.56 and 8.97

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Solution

The fourth proportional to 9.78, 13.56 and 8.97 is: 12.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.78 : 13.56 = 8.97 : x
  2. Step 2: Convert to fraction form
    9.78/13.56 = 8.97/x
  3. Step 3: Cross multiply
    9.78x = 13.56 × 8.97
  4. Step 4: Simplify right side
    9.78x = 121.63
  5. Step 5: Solve for x
    x = 121.63/9.78
  6. Step 6: Final answer
    x = 12.44

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.