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Finding the Fourth Proportional to 77.48, 107.40 and 76.19

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Solution

The fourth proportional to 77.48, 107.40 and 76.19 is: 105.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.48 : 107.40 = 76.19 : x
  2. Step 2: Convert to fraction form
    77.48/107.40 = 76.19/x
  3. Step 3: Cross multiply
    77.48x = 107.40 × 76.19
  4. Step 4: Simplify right side
    77.48x = 8,182.94
  5. Step 5: Solve for x
    x = 8,182.94/77.48
  6. Step 6: Final answer
    x = 105.61

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.