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Finding the Fourth Proportional to 218.58, 301.65 and 131.31

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Solution

The fourth proportional to 218.58, 301.65 and 131.31 is: 181.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.58 : 301.65 = 131.31 : x
  2. Step 2: Convert to fraction form
    218.58/301.65 = 131.31/x
  3. Step 3: Cross multiply
    218.58x = 301.65 × 131.31
  4. Step 4: Simplify right side
    218.58x = 39,609.66
  5. Step 5: Solve for x
    x = 39,609.66/218.58
  6. Step 6: Final answer
    x = 181.21

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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.