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Finding the Fourth Proportional to 274.98, 412.38 and 138.10

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Solution

The fourth proportional to 274.98, 412.38 and 138.10 is: 207.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.98 : 412.38 = 138.10 : x
  2. Step 2: Convert to fraction form
    274.98/412.38 = 138.10/x
  3. Step 3: Cross multiply
    274.98x = 412.38 × 138.10
  4. Step 4: Simplify right side
    274.98x = 56,949.68
  5. Step 5: Solve for x
    x = 56,949.68/274.98
  6. Step 6: Final answer
    x = 207.10

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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.