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Finding the Fourth Proportional to 393.40, 588.58 and 338.12

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Solution

The fourth proportional to 393.40, 588.58 and 338.12 is: 505.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.40 : 588.58 = 338.12 : x
  2. Step 2: Convert to fraction form
    393.40/588.58 = 338.12/x
  3. Step 3: Cross multiply
    393.40x = 588.58 × 338.12
  4. Step 4: Simplify right side
    393.40x = 199,010.67
  5. Step 5: Solve for x
    x = 199,010.67/393.40
  6. Step 6: Final answer
    x = 505.87

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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.