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Finding the Fourth Proportional to 133.28, 199.86 and 78.43

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Solution

The fourth proportional to 133.28, 199.86 and 78.43 is: 117.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.28 : 199.86 = 78.43 : x
  2. Step 2: Convert to fraction form
    133.28/199.86 = 78.43/x
  3. Step 3: Cross multiply
    133.28x = 199.86 × 78.43
  4. Step 4: Simplify right side
    133.28x = 15,674.81
  5. Step 5: Solve for x
    x = 15,674.81/133.28
  6. Step 6: Final answer
    x = 117.61

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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.