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Finding the Fourth Proportional to 392.72, 589.12 and 132.71

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Solution

The fourth proportional to 392.72, 589.12 and 132.71 is: 199.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.72 : 589.12 = 132.71 : x
  2. Step 2: Convert to fraction form
    392.72/589.12 = 132.71/x
  3. Step 3: Cross multiply
    392.72x = 589.12 × 132.71
  4. Step 4: Simplify right side
    392.72x = 78,178.84
  5. Step 5: Solve for x
    x = 78,178.84/392.72
  6. Step 6: Final answer
    x = 199.07

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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.