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Finding the Fourth Proportional to 132.93, 199.21 and 81.45

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Solution

The fourth proportional to 132.93, 199.21 and 81.45 is: 122.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.93 : 199.21 = 81.45 : x
  2. Step 2: Convert to fraction form
    132.93/199.21 = 81.45/x
  3. Step 3: Cross multiply
    132.93x = 199.21 × 81.45
  4. Step 4: Simplify right side
    132.93x = 16,225.65
  5. Step 5: Solve for x
    x = 16,225.65/132.93
  6. Step 6: Final answer
    x = 122.06

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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.