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Finding the Fourth Proportional to 166.64, 249.65 and 85.54

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Solution

The fourth proportional to 166.64, 249.65 and 85.54 is: 128.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.64 : 249.65 = 85.54 : x
  2. Step 2: Convert to fraction form
    166.64/249.65 = 85.54/x
  3. Step 3: Cross multiply
    166.64x = 249.65 × 85.54
  4. Step 4: Simplify right side
    166.64x = 21,354.33
  5. Step 5: Solve for x
    x = 21,354.33/166.64
  6. Step 6: Final answer
    x = 128.15

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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.