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Finding the Fourth Proportional to 11.09, 15.31 and 7.00

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Solution

The fourth proportional to 11.09, 15.31 and 7.00 is: 9.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.09 : 15.31 = 7.00 : x
  2. Step 2: Convert to fraction form
    11.09/15.31 = 7.00/x
  3. Step 3: Cross multiply
    11.09x = 15.31 × 7.00
  4. Step 4: Simplify right side
    11.09x = 107.11
  5. Step 5: Solve for x
    x = 107.11/11.09
  6. Step 6: Final answer
    x = 9.66

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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.