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Finding the Fourth Proportional to 392.56, 588.96 and 253.80

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Solution

The fourth proportional to 392.56, 588.96 and 253.80 is: 380.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.56 : 588.96 = 253.80 : x
  2. Step 2: Convert to fraction form
    392.56/588.96 = 253.80/x
  3. Step 3: Cross multiply
    392.56x = 588.96 × 253.80
  4. Step 4: Simplify right side
    392.56x = 149,478.05
  5. Step 5: Solve for x
    x = 149,478.05/392.56
  6. Step 6: Final answer
    x = 380.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.