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Finding the Fourth Proportional to 10.91, 15.05 and 8.00

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Solution

The fourth proportional to 10.91, 15.05 and 8.00 is: 11.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.91 : 15.05 = 8.00 : x
  2. Step 2: Convert to fraction form
    10.91/15.05 = 8.00/x
  3. Step 3: Cross multiply
    10.91x = 15.05 × 8.00
  4. Step 4: Simplify right side
    10.91x = 120.28
  5. Step 5: Solve for x
    x = 120.28/10.91
  6. Step 6: Final answer
    x = 11.03

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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.