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Finding the Fourth Proportional to 391.88, 540.88 and 236.72

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Solution

The fourth proportional to 391.88, 540.88 and 236.72 is: 326.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.88 : 540.88 = 236.72 : x
  2. Step 2: Convert to fraction form
    391.88/540.88 = 236.72/x
  3. Step 3: Cross multiply
    391.88x = 540.88 × 236.72
  4. Step 4: Simplify right side
    391.88x = 128,033.82
  5. Step 5: Solve for x
    x = 128,033.82/391.88
  6. Step 6: Final answer
    x = 326.72

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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.