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Finding the Fourth Proportional to 308.36, 423.78 and 277.60

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Solution

The fourth proportional to 308.36, 423.78 and 277.60 is: 381.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.36 : 423.78 = 277.60 : x
  2. Step 2: Convert to fraction form
    308.36/423.78 = 277.60/x
  3. Step 3: Cross multiply
    308.36x = 423.78 × 277.60
  4. Step 4: Simplify right side
    308.36x = 117,641.33
  5. Step 5: Solve for x
    x = 117,641.33/308.36
  6. Step 6: Final answer
    x = 381.51

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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.