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Finding the Fourth Proportional to 136.70, 204.74 and 81.03

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Solution

The fourth proportional to 136.70, 204.74 and 81.03 is: 121.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.70 : 204.74 = 81.03 : x
  2. Step 2: Convert to fraction form
    136.70/204.74 = 81.03/x
  3. Step 3: Cross multiply
    136.70x = 204.74 × 81.03
  4. Step 4: Simplify right side
    136.70x = 16,590.08
  5. Step 5: Solve for x
    x = 16,590.08/136.70
  6. Step 6: Final answer
    x = 121.36

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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.