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Finding the Fourth Proportional to 133.48, 200.40 and 92.80

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Solution

The fourth proportional to 133.48, 200.40 and 92.80 is: 139.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.48 : 200.40 = 92.80 : x
  2. Step 2: Convert to fraction form
    133.48/200.40 = 92.80/x
  3. Step 3: Cross multiply
    133.48x = 200.40 × 92.80
  4. Step 4: Simplify right side
    133.48x = 18,597.12
  5. Step 5: Solve for x
    x = 18,597.12/133.48
  6. Step 6: Final answer
    x = 139.33

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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.