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Finding the Fourth Proportional to 391.84, 540.72 and 217.18

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Solution

The fourth proportional to 391.84, 540.72 and 217.18 is: 299.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.84 : 540.72 = 217.18 : x
  2. Step 2: Convert to fraction form
    391.84/540.72 = 217.18/x
  3. Step 3: Cross multiply
    391.84x = 540.72 × 217.18
  4. Step 4: Simplify right side
    391.84x = 117,433.57
  5. Step 5: Solve for x
    x = 117,433.57/391.84
  6. Step 6: Final answer
    x = 299.70

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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.