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Finding the Fourth Proportional to 77.94, 117.12 and 68.92

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Solution

The fourth proportional to 77.94, 117.12 and 68.92 is: 103.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.94 : 117.12 = 68.92 : x
  2. Step 2: Convert to fraction form
    77.94/117.12 = 68.92/x
  3. Step 3: Cross multiply
    77.94x = 117.12 × 68.92
  4. Step 4: Simplify right side
    77.94x = 8,071.91
  5. Step 5: Solve for x
    x = 8,071.91/77.94
  6. Step 6: Final answer
    x = 103.57

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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.