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Finding the Fourth Proportional to 393.25, 589.88 and 136.75

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Solution

The fourth proportional to 393.25, 589.88 and 136.75 is: 205.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.25 : 589.88 = 136.75 : x
  2. Step 2: Convert to fraction form
    393.25/589.88 = 136.75/x
  3. Step 3: Cross multiply
    393.25x = 589.88 × 136.75
  4. Step 4: Simplify right side
    393.25x = 80,666.09
  5. Step 5: Solve for x
    x = 80,666.09/393.25
  6. Step 6: Final answer
    x = 205.13

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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.