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Finding the Fourth Proportional to 439.45, 659.21 and 165.49

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Solution

The fourth proportional to 439.45, 659.21 and 165.49 is: 248.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.45 : 659.21 = 165.49 : x
  2. Step 2: Convert to fraction form
    439.45/659.21 = 165.49/x
  3. Step 3: Cross multiply
    439.45x = 659.21 × 165.49
  4. Step 4: Simplify right side
    439.45x = 109,090.19
  5. Step 5: Solve for x
    x = 109,090.19/439.45
  6. Step 6: Final answer
    x = 248.24

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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.