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Finding the Fourth Proportional to 391.43, 540.14 and 253.43

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Solution

The fourth proportional to 391.43, 540.14 and 253.43 is: 349.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.43 : 540.14 = 253.43 : x
  2. Step 2: Convert to fraction form
    391.43/540.14 = 253.43/x
  3. Step 3: Cross multiply
    391.43x = 540.14 × 253.43
  4. Step 4: Simplify right side
    391.43x = 136,886.41
  5. Step 5: Solve for x
    x = 136,886.41/391.43
  6. Step 6: Final answer
    x = 349.71

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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.