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Finding the Fourth Proportional to 77.29, 115.49 and 68.04

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Solution

The fourth proportional to 77.29, 115.49 and 68.04 is: 101.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.29 : 115.49 = 68.04 : x
  2. Step 2: Convert to fraction form
    77.29/115.49 = 68.04/x
  3. Step 3: Cross multiply
    77.29x = 115.49 × 68.04
  4. Step 4: Simplify right side
    77.29x = 7,858.11
  5. Step 5: Solve for x
    x = 7,858.11/77.29
  6. Step 6: Final answer
    x = 101.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.