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Finding the Fourth Proportional to 391.41, 540.78 and 293.79

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Solution

The fourth proportional to 391.41, 540.78 and 293.79 is: 405.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.41 : 540.78 = 293.79 : x
  2. Step 2: Convert to fraction form
    391.41/540.78 = 293.79/x
  3. Step 3: Cross multiply
    391.41x = 540.78 × 293.79
  4. Step 4: Simplify right side
    391.41x = 158,875.76
  5. Step 5: Solve for x
    x = 158,875.76/391.41
  6. Step 6: Final answer
    x = 405.91

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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.