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Finding the Fourth Proportional to 160.31, 221.43 and 129.34

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Solution

The fourth proportional to 160.31, 221.43 and 129.34 is: 178.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.31 : 221.43 = 129.34 : x
  2. Step 2: Convert to fraction form
    160.31/221.43 = 129.34/x
  3. Step 3: Cross multiply
    160.31x = 221.43 × 129.34
  4. Step 4: Simplify right side
    160.31x = 28,639.69
  5. Step 5: Solve for x
    x = 28,639.69/160.31
  6. Step 6: Final answer
    x = 178.66

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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.