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Finding the Fourth Proportional to 274.78, 412.20 and 92.16

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Solution

The fourth proportional to 274.78, 412.20 and 92.16 is: 138.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.78 : 412.20 = 92.16 : x
  2. Step 2: Convert to fraction form
    274.78/412.20 = 92.16/x
  3. Step 3: Cross multiply
    274.78x = 412.20 × 92.16
  4. Step 4: Simplify right side
    274.78x = 37,988.35
  5. Step 5: Solve for x
    x = 37,988.35/274.78
  6. Step 6: Final answer
    x = 138.25

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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.