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Finding the Fourth Proportional to 160.78, 221.36 and 137.42

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Solution

The fourth proportional to 160.78, 221.36 and 137.42 is: 189.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.78 : 221.36 = 137.42 : x
  2. Step 2: Convert to fraction form
    160.78/221.36 = 137.42/x
  3. Step 3: Cross multiply
    160.78x = 221.36 × 137.42
  4. Step 4: Simplify right side
    160.78x = 30,419.29
  5. Step 5: Solve for x
    x = 30,419.29/160.78
  6. Step 6: Final answer
    x = 189.20

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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.