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Finding the Fourth Proportional to 133.15, 183.78 and 77.88

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Solution

The fourth proportional to 133.15, 183.78 and 77.88 is: 107.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.15 : 183.78 = 77.88 : x
  2. Step 2: Convert to fraction form
    133.15/183.78 = 77.88/x
  3. Step 3: Cross multiply
    133.15x = 183.78 × 77.88
  4. Step 4: Simplify right side
    133.15x = 14,312.79
  5. Step 5: Solve for x
    x = 14,312.79/133.15
  6. Step 6: Final answer
    x = 107.49

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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.