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Finding the Fourth Proportional to 392.55, 541.65 and 330.22

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Solution

The fourth proportional to 392.55, 541.65 and 330.22 is: 455.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.55 : 541.65 = 330.22 : x
  2. Step 2: Convert to fraction form
    392.55/541.65 = 330.22/x
  3. Step 3: Cross multiply
    392.55x = 541.65 × 330.22
  4. Step 4: Simplify right side
    392.55x = 178,863.66
  5. Step 5: Solve for x
    x = 178,863.66/392.55
  6. Step 6: Final answer
    x = 455.65

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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.