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Finding the Fourth Proportional to 200.12, 300.42 and 130.80

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Solution

The fourth proportional to 200.12, 300.42 and 130.80 is: 196.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.12 : 300.42 = 130.80 : x
  2. Step 2: Convert to fraction form
    200.12/300.42 = 130.80/x
  3. Step 3: Cross multiply
    200.12x = 300.42 × 130.80
  4. Step 4: Simplify right side
    200.12x = 39,294.94
  5. Step 5: Solve for x
    x = 39,294.94/200.12
  6. Step 6: Final answer
    x = 196.36

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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.