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Finding the Fourth Proportional to 308.72, 423.25 and 303.28

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Solution

The fourth proportional to 308.72, 423.25 and 303.28 is: 415.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.72 : 423.25 = 303.28 : x
  2. Step 2: Convert to fraction form
    308.72/423.25 = 303.28/x
  3. Step 3: Cross multiply
    308.72x = 423.25 × 303.28
  4. Step 4: Simplify right side
    308.72x = 128,363.26
  5. Step 5: Solve for x
    x = 128,363.26/308.72
  6. Step 6: Final answer
    x = 415.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.