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Finding the Fourth Proportional to 391.86, 587.91 and 135.36

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Solution

The fourth proportional to 391.86, 587.91 and 135.36 is: 203.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.86 : 587.91 = 135.36 : x
  2. Step 2: Convert to fraction form
    391.86/587.91 = 135.36/x
  3. Step 3: Cross multiply
    391.86x = 587.91 × 135.36
  4. Step 4: Simplify right side
    391.86x = 79,579.50
  5. Step 5: Solve for x
    x = 79,579.50/391.86
  6. Step 6: Final answer
    x = 203.08

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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.