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Finding the Fourth Proportional to 111.08, 166.21 and 85.34

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Solution

The fourth proportional to 111.08, 166.21 and 85.34 is: 127.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.08 : 166.21 = 85.34 : x
  2. Step 2: Convert to fraction form
    111.08/166.21 = 85.34/x
  3. Step 3: Cross multiply
    111.08x = 166.21 × 85.34
  4. Step 4: Simplify right side
    111.08x = 14,184.36
  5. Step 5: Solve for x
    x = 14,184.36/111.08
  6. Step 6: Final answer
    x = 127.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.