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Finding the Fourth Proportional to 55.28, 82.38 and 53.79

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Solution

The fourth proportional to 55.28, 82.38 and 53.79 is: 80.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.28 : 82.38 = 53.79 : x
  2. Step 2: Convert to fraction form
    55.28/82.38 = 53.79/x
  3. Step 3: Cross multiply
    55.28x = 82.38 × 53.79
  4. Step 4: Simplify right side
    55.28x = 4,431.22
  5. Step 5: Solve for x
    x = 4,431.22/55.28
  6. Step 6: Final answer
    x = 80.17

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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.