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Finding the Fourth Proportional to 392.87, 589.38 and 118.95

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Solution

The fourth proportional to 392.87, 589.38 and 118.95 is: 178.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.87 : 589.38 = 118.95 : x
  2. Step 2: Convert to fraction form
    392.87/589.38 = 118.95/x
  3. Step 3: Cross multiply
    392.87x = 589.38 × 118.95
  4. Step 4: Simplify right side
    392.87x = 70,106.75
  5. Step 5: Solve for x
    x = 70,106.75/392.87
  6. Step 6: Final answer
    x = 178.45

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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.