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Finding the Fourth Proportional to 195.69, 270.05 and 112.80

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Solution

The fourth proportional to 195.69, 270.05 and 112.80 is: 155.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    195.69 : 270.05 = 112.80 : x
  2. Step 2: Convert to fraction form
    195.69/270.05 = 112.80/x
  3. Step 3: Cross multiply
    195.69x = 270.05 × 112.80
  4. Step 4: Simplify right side
    195.69x = 30,461.64
  5. Step 5: Solve for x
    x = 30,461.64/195.69
  6. Step 6: Final answer
    x = 155.66

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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.