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Finding the Fourth Proportional to 391.94, 587.78 and 135.38

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Solution

The fourth proportional to 391.94, 587.78 and 135.38 is: 203.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.94 : 587.78 = 135.38 : x
  2. Step 2: Convert to fraction form
    391.94/587.78 = 135.38/x
  3. Step 3: Cross multiply
    391.94x = 587.78 × 135.38
  4. Step 4: Simplify right side
    391.94x = 79,571.06
  5. Step 5: Solve for x
    x = 79,571.06/391.94
  6. Step 6: Final answer
    x = 203.02

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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.