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Finding the Fourth Proportional to 392.98, 589.55 and 119.09

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Solution

The fourth proportional to 392.98, 589.55 and 119.09 is: 178.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.98 : 589.55 = 119.09 : x
  2. Step 2: Convert to fraction form
    392.98/589.55 = 119.09/x
  3. Step 3: Cross multiply
    392.98x = 589.55 × 119.09
  4. Step 4: Simplify right side
    392.98x = 70,210.39
  5. Step 5: Solve for x
    x = 70,210.39/392.98
  6. Step 6: Final answer
    x = 178.66

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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.