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Finding the Fourth Proportional to 9.69, 13.29 and 9.47

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Solution

The fourth proportional to 9.69, 13.29 and 9.47 is: 12.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.69 : 13.29 = 9.47 : x
  2. Step 2: Convert to fraction form
    9.69/13.29 = 9.47/x
  3. Step 3: Cross multiply
    9.69x = 13.29 × 9.47
  4. Step 4: Simplify right side
    9.69x = 125.79
  5. Step 5: Solve for x
    x = 125.79/9.69
  6. Step 6: Final answer
    x = 12.98

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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.