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Finding the Fourth Proportional to 218.57, 301.66 and 131.30

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Solution

The fourth proportional to 218.57, 301.66 and 131.30 is: 181.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.57 : 301.66 = 131.30 : x
  2. Step 2: Convert to fraction form
    218.57/301.66 = 131.30/x
  3. Step 3: Cross multiply
    218.57x = 301.66 × 131.30
  4. Step 4: Simplify right side
    218.57x = 39,606.12
  5. Step 5: Solve for x
    x = 39,606.12/218.57
  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.