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Finding the Fourth Proportional to 13.31, 18.38 and 8.47

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Solution

The fourth proportional to 13.31, 18.38 and 8.47 is: 11.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.31 : 18.38 = 8.47 : x
  2. Step 2: Convert to fraction form
    13.31/18.38 = 8.47/x
  3. Step 3: Cross multiply
    13.31x = 18.38 × 8.47
  4. Step 4: Simplify right side
    13.31x = 155.59
  5. Step 5: Solve for x
    x = 155.59/13.31
  6. Step 6: Final answer
    x = 11.69

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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.