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Finding the Fourth Proportional to 308.75, 425.23 and 287.23

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Solution

The fourth proportional to 308.75, 425.23 and 287.23 is: 395.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.75 : 425.23 = 287.23 : x
  2. Step 2: Convert to fraction form
    308.75/425.23 = 287.23/x
  3. Step 3: Cross multiply
    308.75x = 425.23 × 287.23
  4. Step 4: Simplify right side
    308.75x = 122,138.81
  5. Step 5: Solve for x
    x = 122,138.81/308.75
  6. Step 6: Final answer
    x = 395.59

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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.