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Finding the Fourth Proportional to 391.85, 540.73 and 214.77

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Solution

The fourth proportional to 391.85, 540.73 and 214.77 is: 296.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.85 : 540.73 = 214.77 : x
  2. Step 2: Convert to fraction form
    391.85/540.73 = 214.77/x
  3. Step 3: Cross multiply
    391.85x = 540.73 × 214.77
  4. Step 4: Simplify right side
    391.85x = 116,132.58
  5. Step 5: Solve for x
    x = 116,132.58/391.85
  6. Step 6: Final answer
    x = 296.37

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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.