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Finding the Fourth Proportional to 391.03, 538.26 and 328.18

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Solution

The fourth proportional to 391.03, 538.26 and 328.18 is: 451.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.03 : 538.26 = 328.18 : x
  2. Step 2: Convert to fraction form
    391.03/538.26 = 328.18/x
  3. Step 3: Cross multiply
    391.03x = 538.26 × 328.18
  4. Step 4: Simplify right side
    391.03x = 176,646.17
  5. Step 5: Solve for x
    x = 176,646.17/391.03
  6. Step 6: Final answer
    x = 451.75

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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.