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Finding the Fourth Proportional to 222.96, 307.68 and 129.72

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Solution

The fourth proportional to 222.96, 307.68 and 129.72 is: 179.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.96 : 307.68 = 129.72 : x
  2. Step 2: Convert to fraction form
    222.96/307.68 = 129.72/x
  3. Step 3: Cross multiply
    222.96x = 307.68 × 129.72
  4. Step 4: Simplify right side
    222.96x = 39,912.25
  5. Step 5: Solve for x
    x = 39,912.25/222.96
  6. Step 6: Final answer
    x = 179.01

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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.