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Finding the Fourth Proportional to 392.49, 541.08 and 280.51

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Solution

The fourth proportional to 392.49, 541.08 and 280.51 is: 386.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.49 : 541.08 = 280.51 : x
  2. Step 2: Convert to fraction form
    392.49/541.08 = 280.51/x
  3. Step 3: Cross multiply
    392.49x = 541.08 × 280.51
  4. Step 4: Simplify right side
    392.49x = 151,778.35
  5. Step 5: Solve for x
    x = 151,778.35/392.49
  6. Step 6: Final answer
    x = 386.71

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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.