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Finding the Fourth Proportional to 77.08, 115.46 and 39

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Solution

The fourth proportional to 77.08, 115.46 and 39 is: 58.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.08 : 115.46 = 39 : x
  2. Step 2: Convert to fraction form
    77.08/115.46 = 39/x
  3. Step 3: Cross multiply
    77.08x = 115.46 × 39
  4. Step 4: Simplify right side
    77.08x = 4,502.94
  5. Step 5: Solve for x
    x = 4,502.94/77.08
  6. Step 6: Final answer
    x = 58.42

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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.