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Finding the Fourth Proportional to 223.05, 307.80 and 129.80

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Solution

The fourth proportional to 223.05, 307.80 and 129.80 is: 179.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.05 : 307.80 = 129.80 : x
  2. Step 2: Convert to fraction form
    223.05/307.80 = 129.80/x
  3. Step 3: Cross multiply
    223.05x = 307.80 × 129.80
  4. Step 4: Simplify right side
    223.05x = 39,951.67
  5. Step 5: Solve for x
    x = 39,951.67/223.05
  6. Step 6: Final answer
    x = 179.12

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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.