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Finding the Fourth Proportional to 391.50, 540.14 and 225.69

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Solution

The fourth proportional to 391.50, 540.14 and 225.69 is: 311.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.50 : 540.14 = 225.69 : x
  2. Step 2: Convert to fraction form
    391.50/540.14 = 225.69/x
  3. Step 3: Cross multiply
    391.50x = 540.14 × 225.69
  4. Step 4: Simplify right side
    391.50x = 121,901.81
  5. Step 5: Solve for x
    x = 121,901.81/391.50
  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.