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Finding the Fourth Proportional to 222.81, 307.47 and 129.61

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Solution

The fourth proportional to 222.81, 307.47 and 129.61 is: 178.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.81 : 307.47 = 129.61 : x
  2. Step 2: Convert to fraction form
    222.81/307.47 = 129.61/x
  3. Step 3: Cross multiply
    222.81x = 307.47 × 129.61
  4. Step 4: Simplify right side
    222.81x = 39,852.06
  5. Step 5: Solve for x
    x = 39,852.06/222.81
  6. Step 6: Final answer
    x = 178.86

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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.