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Finding the Fourth Proportional to 318.57, 439.32 and 208.01

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Solution

The fourth proportional to 318.57, 439.32 and 208.01 is: 286.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.57 : 439.32 = 208.01 : x
  2. Step 2: Convert to fraction form
    318.57/439.32 = 208.01/x
  3. Step 3: Cross multiply
    318.57x = 439.32 × 208.01
  4. Step 4: Simplify right side
    318.57x = 91,380.76
  5. Step 5: Solve for x
    x = 91,380.76/318.57
  6. Step 6: Final answer
    x = 286.85

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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.