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Finding the Fourth Proportional to 277.38, 415.78 and 138.26

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Solution

The fourth proportional to 277.38, 415.78 and 138.26 is: 207.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.38 : 415.78 = 138.26 : x
  2. Step 2: Convert to fraction form
    277.38/415.78 = 138.26/x
  3. Step 3: Cross multiply
    277.38x = 415.78 × 138.26
  4. Step 4: Simplify right side
    277.38x = 57,485.74
  5. Step 5: Solve for x
    x = 57,485.74/277.38
  6. Step 6: Final answer
    x = 207.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.