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Finding the Fourth Proportional to 392.19, 541.20 and 217.51

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Solution

The fourth proportional to 392.19, 541.20 and 217.51 is: 300.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.19 : 541.20 = 217.51 : x
  2. Step 2: Convert to fraction form
    392.19/541.20 = 217.51/x
  3. Step 3: Cross multiply
    392.19x = 541.20 × 217.51
  4. Step 4: Simplify right side
    392.19x = 117,716.41
  5. Step 5: Solve for x
    x = 117,716.41/392.19
  6. Step 6: Final answer
    x = 300.15

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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.