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Finding the Fourth Proportional to 166.64, 249.62 and 139.28

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Solution

The fourth proportional to 166.64, 249.62 and 139.28 is: 208.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.64 : 249.62 = 139.28 : x
  2. Step 2: Convert to fraction form
    166.64/249.62 = 139.28/x
  3. Step 3: Cross multiply
    166.64x = 249.62 × 139.28
  4. Step 4: Simplify right side
    166.64x = 34,765.13
  5. Step 5: Solve for x
    x = 34,765.13/166.64
  6. Step 6: Final answer
    x = 208.63

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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.