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Finding the Fourth Proportional to 391.35, 540.09 and 225.62

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Solution

The fourth proportional to 391.35, 540.09 and 225.62 is: 311.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.35 : 540.09 = 225.62 : x
  2. Step 2: Convert to fraction form
    391.35/540.09 = 225.62/x
  3. Step 3: Cross multiply
    391.35x = 540.09 × 225.62
  4. Step 4: Simplify right side
    391.35x = 121,852.41
  5. Step 5: Solve for x
    x = 121,852.41/391.35
  6. Step 6: Final answer
    x = 311.36

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