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Finding the Fourth Proportional to 11, 15.15 and 8.95

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Solution

The fourth proportional to 11, 15.15 and 8.95 is: 12.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    11 : 15.15 = 8.95 : x
  2. Step 2: Convert to fraction form
    11/15.15 = 8.95/x
  3. Step 3: Cross multiply
    11x = 15.15 × 8.95
  4. Step 4: Simplify right side
    11x = 135.59
  5. Step 5: Solve for x
    x = 135.59/11
  6. Step 6: Final answer
    x = 12.33

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1.5x scale

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.