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Finding the Fourth Proportional to 77.08, 106.15 and 75.38

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Solution

The fourth proportional to 77.08, 106.15 and 75.38 is: 103.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.08 : 106.15 = 75.38 : x
  2. Step 2: Convert to fraction form
    77.08/106.15 = 75.38/x
  3. Step 3: Cross multiply
    77.08x = 106.15 × 75.38
  4. Step 4: Simplify right side
    77.08x = 8,001.59
  5. Step 5: Solve for x
    x = 8,001.59/77.08
  6. Step 6: Final answer
    x = 103.81

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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.