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Finding the Fourth Proportional to 133.13, 183.68 and 77.85

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Solution

The fourth proportional to 133.13, 183.68 and 77.85 is: 107.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.13 : 183.68 = 77.85 : x
  2. Step 2: Convert to fraction form
    133.13/183.68 = 77.85/x
  3. Step 3: Cross multiply
    133.13x = 183.68 × 77.85
  4. Step 4: Simplify right side
    133.13x = 14,299.17
  5. Step 5: Solve for x
    x = 14,299.17/133.13
  6. Step 6: Final answer
    x = 107.41

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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.