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Finding the Fourth Proportional to 133.36, 183.98 and 86.74

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Solution

The fourth proportional to 133.36, 183.98 and 86.74 is: 119.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.36 : 183.98 = 86.74 : x
  2. Step 2: Convert to fraction form
    133.36/183.98 = 86.74/x
  3. Step 3: Cross multiply
    133.36x = 183.98 × 86.74
  4. Step 4: Simplify right side
    133.36x = 15,958.43
  5. Step 5: Solve for x
    x = 15,958.43/133.36
  6. Step 6: Final answer
    x = 119.66

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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.