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Finding the Fourth Proportional to 390.57, 539.22 and 272.49

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Solution

The fourth proportional to 390.57, 539.22 and 272.49 is: 376.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.57 : 539.22 = 272.49 : x
  2. Step 2: Convert to fraction form
    390.57/539.22 = 272.49/x
  3. Step 3: Cross multiply
    390.57x = 539.22 × 272.49
  4. Step 4: Simplify right side
    390.57x = 146,932.06
  5. Step 5: Solve for x
    x = 146,932.06/390.57
  6. Step 6: Final answer
    x = 376.20

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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.