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Finding the Fourth Proportional to 111.30, 166.80 and 57.21

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Solution

The fourth proportional to 111.30, 166.80 and 57.21 is: 85.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.30 : 166.80 = 57.21 : x
  2. Step 2: Convert to fraction form
    111.30/166.80 = 57.21/x
  3. Step 3: Cross multiply
    111.30x = 166.80 × 57.21
  4. Step 4: Simplify right side
    111.30x = 9,542.63
  5. Step 5: Solve for x
    x = 9,542.63/111.30
  6. Step 6: Final answer
    x = 85.74

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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.