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Finding the Fourth Proportional to 393.08, 541.92 and 274.90

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Solution

The fourth proportional to 393.08, 541.92 and 274.90 is: 378.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.08 : 541.92 = 274.90 : x
  2. Step 2: Convert to fraction form
    393.08/541.92 = 274.90/x
  3. Step 3: Cross multiply
    393.08x = 541.92 × 274.90
  4. Step 4: Simplify right side
    393.08x = 148,973.48
  5. Step 5: Solve for x
    x = 148,973.48/393.08
  6. Step 6: Final answer
    x = 378.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.