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Finding the Fourth Proportional to 111.61, 166.37 and 111.43

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Solution

The fourth proportional to 111.61, 166.37 and 111.43 is: 166.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.61 : 166.37 = 111.43 : x
  2. Step 2: Convert to fraction form
    111.61/166.37 = 111.43/x
  3. Step 3: Cross multiply
    111.61x = 166.37 × 111.43
  4. Step 4: Simplify right side
    111.61x = 18,538.61
  5. Step 5: Solve for x
    x = 18,538.61/111.61
  6. Step 6: Final answer
    x = 166.10

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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.