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Finding the Fourth Proportional to 77.00, 115.29 and 54.05

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Solution

The fourth proportional to 77.00, 115.29 and 54.05 is: 80.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.00 : 115.29 = 54.05 : x
  2. Step 2: Convert to fraction form
    77.00/115.29 = 54.05/x
  3. Step 3: Cross multiply
    77.00x = 115.29 × 54.05
  4. Step 4: Simplify right side
    77.00x = 6,230.85
  5. Step 5: Solve for x
    x = 6,230.85/77.00
  6. Step 6: Final answer
    x = 80.93

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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.