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Finding the Fourth Proportional to 392.09, 541.04 and 217.40

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Solution

The fourth proportional to 392.09, 541.04 and 217.40 is: 299.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.09 : 541.04 = 217.40 : x
  2. Step 2: Convert to fraction form
    392.09/541.04 = 217.40/x
  3. Step 3: Cross multiply
    392.09x = 541.04 × 217.40
  4. Step 4: Simplify right side
    392.09x = 117,618.30
  5. Step 5: Solve for x
    x = 117,618.30/392.09
  6. Step 6: Final answer
    x = 299.98

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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.