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Finding the Fourth Proportional to 391.43, 540.18 and 214.38

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Solution

The fourth proportional to 391.43, 540.18 and 214.38 is: 295.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.43 : 540.18 = 214.38 : x
  2. Step 2: Convert to fraction form
    391.43/540.18 = 214.38/x
  3. Step 3: Cross multiply
    391.43x = 540.18 × 214.38
  4. Step 4: Simplify right side
    391.43x = 115,803.79
  5. Step 5: Solve for x
    x = 115,803.79/391.43
  6. Step 6: Final answer
    x = 295.85

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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.