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Finding the Fourth Proportional to 111.10, 166.65 and 76.90

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Solution

The fourth proportional to 111.10, 166.65 and 76.90 is: 115.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.10 : 166.65 = 76.90 : x
  2. Step 2: Convert to fraction form
    111.10/166.65 = 76.90/x
  3. Step 3: Cross multiply
    111.10x = 166.65 × 76.90
  4. Step 4: Simplify right side
    111.10x = 12,815.39
  5. Step 5: Solve for x
    x = 12,815.39/111.10
  6. Step 6: Final answer
    x = 115.35

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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.