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Finding the Fourth Proportional to 161.90, 243 and 136.38

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Solution

The fourth proportional to 161.90, 243 and 136.38 is: 204.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.90 : 243 = 136.38 : x
  2. Step 2: Convert to fraction form
    161.90/243 = 136.38/x
  3. Step 3: Cross multiply
    161.90x = 243 × 136.38
  4. Step 4: Simplify right side
    161.90x = 33,141.25
  5. Step 5: Solve for x
    x = 33,141.25/161.90
  6. Step 6: Final answer
    x = 204.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.