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Finding the Fourth Proportional to 393.18, 589.81 and 119.30

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Solution

The fourth proportional to 393.18, 589.81 and 119.30 is: 178.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.18 : 589.81 = 119.30 : x
  2. Step 2: Convert to fraction form
    393.18/589.81 = 119.30/x
  3. Step 3: Cross multiply
    393.18x = 589.81 × 119.30
  4. Step 4: Simplify right side
    393.18x = 70,362.26
  5. Step 5: Solve for x
    x = 70,362.26/393.18
  6. Step 6: Final answer
    x = 178.96

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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.