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Finding the Fourth Proportional to 392.48, 541.62 and 217.81

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Solution

The fourth proportional to 392.48, 541.62 and 217.81 is: 300.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.48 : 541.62 = 217.81 : x
  2. Step 2: Convert to fraction form
    392.48/541.62 = 217.81/x
  3. Step 3: Cross multiply
    392.48x = 541.62 × 217.81
  4. Step 4: Simplify right side
    392.48x = 117,968.90
  5. Step 5: Solve for x
    x = 117,968.90/392.48
  6. Step 6: Final answer
    x = 300.58

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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.