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Finding the Fourth Proportional to 111.54, 165.78 and 108.51

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Solution

The fourth proportional to 111.54, 165.78 and 108.51 is: 161.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.54 : 165.78 = 108.51 : x
  2. Step 2: Convert to fraction form
    111.54/165.78 = 108.51/x
  3. Step 3: Cross multiply
    111.54x = 165.78 × 108.51
  4. Step 4: Simplify right side
    111.54x = 17,988.79
  5. Step 5: Solve for x
    x = 17,988.79/111.54
  6. Step 6: Final answer
    x = 161.28

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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.