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Finding the Fourth Proportional to 9.55, 13.20 and 8.39

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Solution

The fourth proportional to 9.55, 13.20 and 8.39 is: 11.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.55 : 13.20 = 8.39 : x
  2. Step 2: Convert to fraction form
    9.55/13.20 = 8.39/x
  3. Step 3: Cross multiply
    9.55x = 13.20 × 8.39
  4. Step 4: Simplify right side
    9.55x = 110.75
  5. Step 5: Solve for x
    x = 110.75/9.55
  6. Step 6: Final answer
    x = 11.60

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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.