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Finding the Fourth Proportional to 327.86, 491.80 and 111.40

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Solution

The fourth proportional to 327.86, 491.80 and 111.40 is: 167.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.86 : 491.80 = 111.40 : x
  2. Step 2: Convert to fraction form
    327.86/491.80 = 111.40/x
  3. Step 3: Cross multiply
    327.86x = 491.80 × 111.40
  4. Step 4: Simplify right side
    327.86x = 54,786.52
  5. Step 5: Solve for x
    x = 54,786.52/327.86
  6. Step 6: Final answer
    x = 167.10

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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.