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Finding the Fourth Proportional to 218.50, 301.55 and 129.98

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Solution

The fourth proportional to 218.50, 301.55 and 129.98 is: 179.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.50 : 301.55 = 129.98 : x
  2. Step 2: Convert to fraction form
    218.50/301.55 = 129.98/x
  3. Step 3: Cross multiply
    218.50x = 301.55 × 129.98
  4. Step 4: Simplify right side
    218.50x = 39,195.57
  5. Step 5: Solve for x
    x = 39,195.57/218.50
  6. Step 6: Final answer
    x = 179.39

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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.