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Finding the Fourth Proportional to 9.81, 13.49 and 9.40

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Solution

The fourth proportional to 9.81, 13.49 and 9.40 is: 12.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.81 : 13.49 = 9.40 : x
  2. Step 2: Convert to fraction form
    9.81/13.49 = 9.40/x
  3. Step 3: Cross multiply
    9.81x = 13.49 × 9.40
  4. Step 4: Simplify right side
    9.81x = 126.81
  5. Step 5: Solve for x
    x = 126.81/9.81
  6. Step 6: Final answer
    x = 12.93

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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.