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Finding the Fourth Proportional to 391.86, 540.75 and 234.40

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Solution

The fourth proportional to 391.86, 540.75 and 234.40 is: 323.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.86 : 540.75 = 234.40 : x
  2. Step 2: Convert to fraction form
    391.86/540.75 = 234.40/x
  3. Step 3: Cross multiply
    391.86x = 540.75 × 234.40
  4. Step 4: Simplify right side
    391.86x = 126,748.51
  5. Step 5: Solve for x
    x = 126,748.51/391.86
  6. Step 6: Final answer
    x = 323.46

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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.