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Finding the Fourth Proportional to 391.74, 540.99 and 236.58

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Solution

The fourth proportional to 391.74, 540.99 and 236.58 is: 326.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.74 : 540.99 = 236.58 : x
  2. Step 2: Convert to fraction form
    391.74/540.99 = 236.58/x
  3. Step 3: Cross multiply
    391.74x = 540.99 × 236.58
  4. Step 4: Simplify right side
    391.74x = 127,987.41
  5. Step 5: Solve for x
    x = 127,987.41/391.74
  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.