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Finding the Fourth Proportional to 391.11, 585.81 and 281.22

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Solution

The fourth proportional to 391.11, 585.81 and 281.22 is: 421.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.11 : 585.81 = 281.22 : x
  2. Step 2: Convert to fraction form
    391.11/585.81 = 281.22/x
  3. Step 3: Cross multiply
    391.11x = 585.81 × 281.22
  4. Step 4: Simplify right side
    391.11x = 164,741.49
  5. Step 5: Solve for x
    x = 164,741.49/391.11
  6. Step 6: Final answer
    x = 421.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.