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Finding the Fourth Proportional to 392.47, 541.62 and 217.85

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Solution

The fourth proportional to 392.47, 541.62 and 217.85 is: 300.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.47 : 541.62 = 217.85 : x
  2. Step 2: Convert to fraction form
    392.47/541.62 = 217.85/x
  3. Step 3: Cross multiply
    392.47x = 541.62 × 217.85
  4. Step 4: Simplify right side
    392.47x = 117,989.21
  5. Step 5: Solve for x
    x = 117,989.21/392.47
  6. Step 6: Final answer
    x = 300.63

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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.