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Finding the Fourth Proportional to 391.18, 540 and 243.94

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Solution

The fourth proportional to 391.18, 540 and 243.94 is: 336.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.18 : 540 = 243.94 : x
  2. Step 2: Convert to fraction form
    391.18/540 = 243.94/x
  3. Step 3: Cross multiply
    391.18x = 540 × 243.94
  4. Step 4: Simplify right side
    391.18x = 131,727.60
  5. Step 5: Solve for x
    x = 131,727.60/391.18
  6. Step 6: Final answer
    x = 336.74

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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.