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Finding the Fourth Proportional to 439.99, 659.97 and 208.80

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Solution

The fourth proportional to 439.99, 659.97 and 208.80 is: 313.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.99 : 659.97 = 208.80 : x
  2. Step 2: Convert to fraction form
    439.99/659.97 = 208.80/x
  3. Step 3: Cross multiply
    439.99x = 659.97 × 208.80
  4. Step 4: Simplify right side
    439.99x = 137,801.74
  5. Step 5: Solve for x
    x = 137,801.74/439.99
  6. Step 6: Final answer
    x = 313.19

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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.