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Finding the Fourth Proportional to 439.98, 659.89 and 166.20

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Solution

The fourth proportional to 439.98, 659.89 and 166.20 is: 249.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.98 : 659.89 = 166.20 : x
  2. Step 2: Convert to fraction form
    439.98/659.89 = 166.20/x
  3. Step 3: Cross multiply
    439.98x = 659.89 × 166.20
  4. Step 4: Simplify right side
    439.98x = 109,673.72
  5. Step 5: Solve for x
    x = 109,673.72/439.98
  6. Step 6: Final answer
    x = 249.27

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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.