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Finding the Fourth Proportional to 392.64, 541.96 and 243.35

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Solution

The fourth proportional to 392.64, 541.96 and 243.35 is: 335.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.64 : 541.96 = 243.35 : x
  2. Step 2: Convert to fraction form
    392.64/541.96 = 243.35/x
  3. Step 3: Cross multiply
    392.64x = 541.96 × 243.35
  4. Step 4: Simplify right side
    392.64x = 131,883.26
  5. Step 5: Solve for x
    x = 131,883.26/392.64
  6. Step 6: Final answer
    x = 335.89

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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.