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Finding the Fourth Proportional to 9.21, 12.66 and 7.05

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Solution

The fourth proportional to 9.21, 12.66 and 7.05 is: 9.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.21 : 12.66 = 7.05 : x
  2. Step 2: Convert to fraction form
    9.21/12.66 = 7.05/x
  3. Step 3: Cross multiply
    9.21x = 12.66 × 7.05
  4. Step 4: Simplify right side
    9.21x = 89.25
  5. Step 5: Solve for x
    x = 89.25/9.21
  6. Step 6: Final answer
    x = 9.69

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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.