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Finding the Fourth Proportional to 318.45, 439.77 and 207.99

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Solution

The fourth proportional to 318.45, 439.77 and 207.99 is: 287.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.45 : 439.77 = 207.99 : x
  2. Step 2: Convert to fraction form
    318.45/439.77 = 207.99/x
  3. Step 3: Cross multiply
    318.45x = 439.77 × 207.99
  4. Step 4: Simplify right side
    318.45x = 91,467.76
  5. Step 5: Solve for x
    x = 91,467.76/318.45
  6. Step 6: Final answer
    x = 287.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.