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Finding the Fourth Proportional to 11.81, 16.29 and 7.20

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Solution

The fourth proportional to 11.81, 16.29 and 7.20 is: 9.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.81 : 16.29 = 7.20 : x
  2. Step 2: Convert to fraction form
    11.81/16.29 = 7.20/x
  3. Step 3: Cross multiply
    11.81x = 16.29 × 7.20
  4. Step 4: Simplify right side
    11.81x = 117.17
  5. Step 5: Solve for x
    x = 117.17/11.81
  6. Step 6: Final answer
    x = 9.93

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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.