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Finding the Fourth Proportional to 392.19, 540.31 and 326.58

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Solution

The fourth proportional to 392.19, 540.31 and 326.58 is: 449.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.19 : 540.31 = 326.58 : x
  2. Step 2: Convert to fraction form
    392.19/540.31 = 326.58/x
  3. Step 3: Cross multiply
    392.19x = 540.31 × 326.58
  4. Step 4: Simplify right side
    392.19x = 176,454.44
  5. Step 5: Solve for x
    x = 176,454.44/392.19
  6. Step 6: Final answer
    x = 449.92

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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.