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Finding the Fourth Proportional to 71.16, 106.83 and 67.38

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Solution

The fourth proportional to 71.16, 106.83 and 67.38 is: 101.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.16 : 106.83 = 67.38 : x
  2. Step 2: Convert to fraction form
    71.16/106.83 = 67.38/x
  3. Step 3: Cross multiply
    71.16x = 106.83 × 67.38
  4. Step 4: Simplify right side
    71.16x = 7,198.21
  5. Step 5: Solve for x
    x = 7,198.21/71.16
  6. Step 6: Final answer
    x = 101.16

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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.