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Finding the Fourth Proportional to 274.97, 412.34 and 138.09

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Solution

The fourth proportional to 274.97, 412.34 and 138.09 is: 207.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.97 : 412.34 = 138.09 : x
  2. Step 2: Convert to fraction form
    274.97/412.34 = 138.09/x
  3. Step 3: Cross multiply
    274.97x = 412.34 × 138.09
  4. Step 4: Simplify right side
    274.97x = 56,941.08
  5. Step 5: Solve for x
    x = 56,941.08/274.97
  6. Step 6: Final answer
    x = 207.08

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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.