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Finding the Fourth Proportional to 392.75, 589.13 and 118.92

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Solution

The fourth proportional to 392.75, 589.13 and 118.92 is: 178.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.75 : 589.13 = 118.92 : x
  2. Step 2: Convert to fraction form
    392.75/589.13 = 118.92/x
  3. Step 3: Cross multiply
    392.75x = 589.13 × 118.92
  4. Step 4: Simplify right side
    392.75x = 70,060.66
  5. Step 5: Solve for x
    x = 70,060.66/392.75
  6. Step 6: Final answer
    x = 178.38

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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.