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Finding the Fourth Proportional to 319.38, 440.43 and 208.62

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Solution

The fourth proportional to 319.38, 440.43 and 208.62 is: 287.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.38 : 440.43 = 208.62 : x
  2. Step 2: Convert to fraction form
    319.38/440.43 = 208.62/x
  3. Step 3: Cross multiply
    319.38x = 440.43 × 208.62
  4. Step 4: Simplify right side
    319.38x = 91,882.51
  5. Step 5: Solve for x
    x = 91,882.51/319.38
  6. Step 6: Final answer
    x = 287.69

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1.5x scale

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.