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Finding the Fourth Proportional to 67.38, 100.90 and 53.81

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Solution

The fourth proportional to 67.38, 100.90 and 53.81 is: 80.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.38 : 100.90 = 53.81 : x
  2. Step 2: Convert to fraction form
    67.38/100.90 = 53.81/x
  3. Step 3: Cross multiply
    67.38x = 100.90 × 53.81
  4. Step 4: Simplify right side
    67.38x = 5,429.16
  5. Step 5: Solve for x
    x = 5,429.16/67.38
  6. Step 6: Final answer
    x = 80.58

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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.