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Finding the Fourth Proportional to 240, 331.20 and 136.50

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Solution

The fourth proportional to 240, 331.20 and 136.50 is: 188.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    240 : 331.20 = 136.50 : x
  2. Step 2: Convert to fraction form
    240/331.20 = 136.50/x
  3. Step 3: Cross multiply
    240x = 331.20 × 136.50
  4. Step 4: Simplify right side
    240x = 45,208.80
  5. Step 5: Solve for x
    x = 45,208.80/240
  6. Step 6: Final answer
    x = 188.37

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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.