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Finding the Fourth Proportional to 55.02, 81.36 and 54.84

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Solution

The fourth proportional to 55.02, 81.36 and 54.84 is: 81.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.02 : 81.36 = 54.84 : x
  2. Step 2: Convert to fraction form
    55.02/81.36 = 54.84/x
  3. Step 3: Cross multiply
    55.02x = 81.36 × 54.84
  4. Step 4: Simplify right side
    55.02x = 4,461.78
  5. Step 5: Solve for x
    x = 4,461.78/55.02
  6. Step 6: Final answer
    x = 81.09

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.