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Finding the Fourth Proportional to 77.37, 106.86 and 76.15

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Solution

The fourth proportional to 77.37, 106.86 and 76.15 is: 105.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.37 : 106.86 = 76.15 : x
  2. Step 2: Convert to fraction form
    77.37/106.86 = 76.15/x
  3. Step 3: Cross multiply
    77.37x = 106.86 × 76.15
  4. Step 4: Simplify right side
    77.37x = 8,137.39
  5. Step 5: Solve for x
    x = 8,137.39/77.37
  6. Step 6: Final answer
    x = 105.17

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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.