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Finding the Fourth Proportional to 390.27, 538.46 and 272.11

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Solution

The fourth proportional to 390.27, 538.46 and 272.11 is: 375.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.27 : 538.46 = 272.11 : x
  2. Step 2: Convert to fraction form
    390.27/538.46 = 272.11/x
  3. Step 3: Cross multiply
    390.27x = 538.46 × 272.11
  4. Step 4: Simplify right side
    390.27x = 146,520.35
  5. Step 5: Solve for x
    x = 146,520.35/390.27
  6. Step 6: Final answer
    x = 375.43

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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.