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Finding the Fourth Proportional to 391.87, 540.87 and 352.46

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Solution

The fourth proportional to 391.87, 540.87 and 352.46 is: 486.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.87 : 540.87 = 352.46 : x
  2. Step 2: Convert to fraction form
    391.87/540.87 = 352.46/x
  3. Step 3: Cross multiply
    391.87x = 540.87 × 352.46
  4. Step 4: Simplify right side
    391.87x = 190,635.04
  5. Step 5: Solve for x
    x = 190,635.04/391.87
  6. Step 6: Final answer
    x = 486.48

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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.