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Finding the Fourth Proportional to 218.21, 301.11 and 130.86

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Solution

The fourth proportional to 218.21, 301.11 and 130.86 is: 180.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.21 : 301.11 = 130.86 : x
  2. Step 2: Convert to fraction form
    218.21/301.11 = 130.86/x
  3. Step 3: Cross multiply
    218.21x = 301.11 × 130.86
  4. Step 4: Simplify right side
    218.21x = 39,403.25
  5. Step 5: Solve for x
    x = 39,403.25/218.21
  6. Step 6: Final answer
    x = 180.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.