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Finding the Fourth Proportional to 218.81, 301.85 and 131.45

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Solution

The fourth proportional to 218.81, 301.85 and 131.45 is: 181.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.81 : 301.85 = 131.45 : x
  2. Step 2: Convert to fraction form
    218.81/301.85 = 131.45/x
  3. Step 3: Cross multiply
    218.81x = 301.85 × 131.45
  4. Step 4: Simplify right side
    218.81x = 39,676.02
  5. Step 5: Solve for x
    x = 39,676.02/218.81
  6. Step 6: Final answer
    x = 181.33

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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.