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Finding the Fourth Proportional to 9.66, 13.21 and 9.60

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Solution

The fourth proportional to 9.66, 13.21 and 9.60 is: 13.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.66 : 13.21 = 9.60 : x
  2. Step 2: Convert to fraction form
    9.66/13.21 = 9.60/x
  3. Step 3: Cross multiply
    9.66x = 13.21 × 9.60
  4. Step 4: Simplify right side
    9.66x = 126.82
  5. Step 5: Solve for x
    x = 126.82/9.66
  6. Step 6: Final answer
    x = 13.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.