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Finding the Fourth Proportional to 166.61, 249.99 and 85.51

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Solution

The fourth proportional to 166.61, 249.99 and 85.51 is: 128.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.61 : 249.99 = 85.51 : x
  2. Step 2: Convert to fraction form
    166.61/249.99 = 85.51/x
  3. Step 3: Cross multiply
    166.61x = 249.99 × 85.51
  4. Step 4: Simplify right side
    166.61x = 21,375.23
  5. Step 5: Solve for x
    x = 21,375.23/166.61
  6. Step 6: Final answer
    x = 128.30

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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.