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Finding the Fourth Proportional to 391.80, 540.17 and 325.17

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Solution

The fourth proportional to 391.80, 540.17 and 325.17 is: 448.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.80 : 540.17 = 325.17 : x
  2. Step 2: Convert to fraction form
    391.80/540.17 = 325.17/x
  3. Step 3: Cross multiply
    391.80x = 540.17 × 325.17
  4. Step 4: Simplify right side
    391.80x = 175,645.45
  5. Step 5: Solve for x
    x = 175,645.45/391.80
  6. Step 6: Final answer
    x = 448.30

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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.