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Finding the Fourth Proportional to 132.97, 199.50 and 78.80

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Solution

The fourth proportional to 132.97, 199.50 and 78.80 is: 118.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.97 : 199.50 = 78.80 : x
  2. Step 2: Convert to fraction form
    132.97/199.50 = 78.80/x
  3. Step 3: Cross multiply
    132.97x = 199.50 × 78.80
  4. Step 4: Simplify right side
    132.97x = 15,720.60
  5. Step 5: Solve for x
    x = 15,720.60/132.97
  6. Step 6: Final answer
    x = 118.23

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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.