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Finding the Fourth Proportional to 155.01, 231.39 and 136.80

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Solution

The fourth proportional to 155.01, 231.39 and 136.80 is: 204.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.01 : 231.39 = 136.80 : x
  2. Step 2: Convert to fraction form
    155.01/231.39 = 136.80/x
  3. Step 3: Cross multiply
    155.01x = 231.39 × 136.80
  4. Step 4: Simplify right side
    155.01x = 31,654.15
  5. Step 5: Solve for x
    x = 31,654.15/155.01
  6. Step 6: Final answer
    x = 204.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.