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Finding the Fourth Proportional to 55.28, 75.80 and 50.09

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Solution

The fourth proportional to 55.28, 75.80 and 50.09 is: 68.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.28 : 75.80 = 50.09 : x
  2. Step 2: Convert to fraction form
    55.28/75.80 = 50.09/x
  3. Step 3: Cross multiply
    55.28x = 75.80 × 50.09
  4. Step 4: Simplify right side
    55.28x = 3,796.57
  5. Step 5: Solve for x
    x = 3,796.57/55.28
  6. Step 6: Final answer
    x = 68.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.