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Finding the Fourth Proportional to 392.79, 591.36 and 325.36

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Solution

The fourth proportional to 392.79, 591.36 and 325.36 is: 489.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.79 : 591.36 = 325.36 : x
  2. Step 2: Convert to fraction form
    392.79/591.36 = 325.36/x
  3. Step 3: Cross multiply
    392.79x = 591.36 × 325.36
  4. Step 4: Simplify right side
    392.79x = 192,404.41
  5. Step 5: Solve for x
    x = 192,404.41/392.79
  6. Step 6: Final answer
    x = 489.84

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.