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Finding the Fourth Proportional to 318.93, 440.13 and 208.63

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Solution

The fourth proportional to 318.93, 440.13 and 208.63 is: 287.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.93 : 440.13 = 208.63 : x
  2. Step 2: Convert to fraction form
    318.93/440.13 = 208.63/x
  3. Step 3: Cross multiply
    318.93x = 440.13 × 208.63
  4. Step 4: Simplify right side
    318.93x = 91,824.32
  5. Step 5: Solve for x
    x = 91,824.32/318.93
  6. Step 6: Final answer
    x = 287.91

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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.