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Finding the Fourth Proportional to 391.39, 540.14 and 225.62

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Solution

The fourth proportional to 391.39, 540.14 and 225.62 is: 311.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.39 : 540.14 = 225.62 : x
  2. Step 2: Convert to fraction form
    391.39/540.14 = 225.62/x
  3. Step 3: Cross multiply
    391.39x = 540.14 × 225.62
  4. Step 4: Simplify right side
    391.39x = 121,866.39
  5. Step 5: Solve for x
    x = 121,866.39/391.39
  6. Step 6: Final answer
    x = 311.37

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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.