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Finding the Fourth Proportional to 16.40, 22.65 and 11.81

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Solution

The fourth proportional to 16.40, 22.65 and 11.81 is: 16.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.40 : 22.65 = 11.81 : x
  2. Step 2: Convert to fraction form
    16.40/22.65 = 11.81/x
  3. Step 3: Cross multiply
    16.40x = 22.65 × 11.81
  4. Step 4: Simplify right side
    16.40x = 267.51
  5. Step 5: Solve for x
    x = 267.51/16.40
  6. Step 6: Final answer
    x = 16.31

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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.