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Finding the Fourth Proportional to 55.20, 82.79 and 19.13

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Solution

The fourth proportional to 55.20, 82.79 and 19.13 is: 28.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.20 : 82.79 = 19.13 : x
  2. Step 2: Convert to fraction form
    55.20/82.79 = 19.13/x
  3. Step 3: Cross multiply
    55.20x = 82.79 × 19.13
  4. Step 4: Simplify right side
    55.20x = 1,583.33
  5. Step 5: Solve for x
    x = 1,583.33/55.20
  6. Step 6: Final answer
    x = 28.68

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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.