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Finding the Fourth Proportional to 393.08, 541.90 and 274.88

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Solution

The fourth proportional to 393.08, 541.90 and 274.88 is: 378.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.08 : 541.90 = 274.88 : x
  2. Step 2: Convert to fraction form
    393.08/541.90 = 274.88/x
  3. Step 3: Cross multiply
    393.08x = 541.90 × 274.88
  4. Step 4: Simplify right side
    393.08x = 148,957.47
  5. Step 5: Solve for x
    x = 148,957.47/393.08
  6. Step 6: Final answer
    x = 378.95

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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.