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Finding the Fourth Proportional to 13.49, 18.61 and 9.40

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Solution

The fourth proportional to 13.49, 18.61 and 9.40 is: 12.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.49 : 18.61 = 9.40 : x
  2. Step 2: Convert to fraction form
    13.49/18.61 = 9.40/x
  3. Step 3: Cross multiply
    13.49x = 18.61 × 9.40
  4. Step 4: Simplify right side
    13.49x = 174.93
  5. Step 5: Solve for x
    x = 174.93/13.49
  6. Step 6: Final answer
    x = 12.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.