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Finding the Fourth Proportional to 392.22, 541.21 and 217.57

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Solution

The fourth proportional to 392.22, 541.21 and 217.57 is: 300.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.22 : 541.21 = 217.57 : x
  2. Step 2: Convert to fraction form
    392.22/541.21 = 217.57/x
  3. Step 3: Cross multiply
    392.22x = 541.21 × 217.57
  4. Step 4: Simplify right side
    392.22x = 117,751.06
  5. Step 5: Solve for x
    x = 117,751.06/392.22
  6. Step 6: Final answer
    x = 300.22

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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.