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Finding the Fourth Proportional to 218.29, 301.15 and 129.75

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Solution

The fourth proportional to 218.29, 301.15 and 129.75 is: 179.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.29 : 301.15 = 129.75 : x
  2. Step 2: Convert to fraction form
    218.29/301.15 = 129.75/x
  3. Step 3: Cross multiply
    218.29x = 301.15 × 129.75
  4. Step 4: Simplify right side
    218.29x = 39,074.21
  5. Step 5: Solve for x
    x = 39,074.21/218.29
  6. Step 6: Final answer
    x = 179.00

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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.