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Finding the Fourth Proportional to 392.23, 541.20 and 261.40

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Solution

The fourth proportional to 392.23, 541.20 and 261.40 is: 360.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.23 : 541.20 = 261.40 : x
  2. Step 2: Convert to fraction form
    392.23/541.20 = 261.40/x
  3. Step 3: Cross multiply
    392.23x = 541.20 × 261.40
  4. Step 4: Simplify right side
    392.23x = 141,469.68
  5. Step 5: Solve for x
    x = 141,469.68/392.23
  6. Step 6: Final answer
    x = 360.68

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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.