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Finding the Fourth Proportional to 439.90, 659.66 and 166.21

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Solution

The fourth proportional to 439.90, 659.66 and 166.21 is: 249.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.90 : 659.66 = 166.21 : x
  2. Step 2: Convert to fraction form
    439.90/659.66 = 166.21/x
  3. Step 3: Cross multiply
    439.90x = 659.66 × 166.21
  4. Step 4: Simplify right side
    439.90x = 109,642.09
  5. Step 5: Solve for x
    x = 109,642.09/439.90
  6. Step 6: Final answer
    x = 249.24

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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.