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Finding the Fourth Proportional to 11.70, 17.49 and 9

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Solution

The fourth proportional to 11.70, 17.49 and 9 is: 13.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.70 : 17.49 = 9 : x
  2. Step 2: Convert to fraction form
    11.70/17.49 = 9/x
  3. Step 3: Cross multiply
    11.70x = 17.49 × 9
  4. Step 4: Simplify right side
    11.70x = 157.41
  5. Step 5: Solve for x
    x = 157.41/11.70
  6. Step 6: Final answer
    x = 13.45

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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.