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Finding the Fourth Proportional to 318.92, 440.07 and 208.61

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Solution

The fourth proportional to 318.92, 440.07 and 208.61 is: 287.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.92 : 440.07 = 208.61 : x
  2. Step 2: Convert to fraction form
    318.92/440.07 = 208.61/x
  3. Step 3: Cross multiply
    318.92x = 440.07 × 208.61
  4. Step 4: Simplify right side
    318.92x = 91,803.00
  5. Step 5: Solve for x
    x = 91,803.00/318.92
  6. Step 6: Final answer
    x = 287.86

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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.