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Finding the Fourth Proportional to 222.71, 307.32 and 129.42

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Solution

The fourth proportional to 222.71, 307.32 and 129.42 is: 178.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.71 : 307.32 = 129.42 : x
  2. Step 2: Convert to fraction form
    222.71/307.32 = 129.42/x
  3. Step 3: Cross multiply
    222.71x = 307.32 × 129.42
  4. Step 4: Simplify right side
    222.71x = 39,773.35
  5. Step 5: Solve for x
    x = 39,773.35/222.71
  6. Step 6: Final answer
    x = 178.59

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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.