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Finding the Fourth Proportional to 55.38, 82.58 and 54.21

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Solution

The fourth proportional to 55.38, 82.58 and 54.21 is: 80.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.38 : 82.58 = 54.21 : x
  2. Step 2: Convert to fraction form
    55.38/82.58 = 54.21/x
  3. Step 3: Cross multiply
    55.38x = 82.58 × 54.21
  4. Step 4: Simplify right side
    55.38x = 4,476.66
  5. Step 5: Solve for x
    x = 4,476.66/55.38
  6. Step 6: Final answer
    x = 80.84

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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.