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Finding the Fourth Proportional to 67.36, 100.60 and 52.80

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Solution

The fourth proportional to 67.36, 100.60 and 52.80 is: 78.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.36 : 100.60 = 52.80 : x
  2. Step 2: Convert to fraction form
    67.36/100.60 = 52.80/x
  3. Step 3: Cross multiply
    67.36x = 100.60 × 52.80
  4. Step 4: Simplify right side
    67.36x = 5,311.68
  5. Step 5: Solve for x
    x = 5,311.68/67.36
  6. Step 6: Final answer
    x = 78.86

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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.