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Finding the Fourth Proportional to 218.89, 302.09 and 131.55

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Solution

The fourth proportional to 218.89, 302.09 and 131.55 is: 181.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.89 : 302.09 = 131.55 : x
  2. Step 2: Convert to fraction form
    218.89/302.09 = 131.55/x
  3. Step 3: Cross multiply
    218.89x = 302.09 × 131.55
  4. Step 4: Simplify right side
    218.89x = 39,739.94
  5. Step 5: Solve for x
    x = 39,739.94/218.89
  6. Step 6: Final answer
    x = 181.55

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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.