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Finding the Fourth Proportional to 116.11, 172.79 and 111.79

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Solution

The fourth proportional to 116.11, 172.79 and 111.79 is: 166.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.11 : 172.79 = 111.79 : x
  2. Step 2: Convert to fraction form
    116.11/172.79 = 111.79/x
  3. Step 3: Cross multiply
    116.11x = 172.79 × 111.79
  4. Step 4: Simplify right side
    116.11x = 19,315.33
  5. Step 5: Solve for x
    x = 19,315.33/116.11
  6. Step 6: Final answer
    x = 166.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.