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Finding the Fourth Proportional to 54.50, 81.36 and 51.12

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Solution

The fourth proportional to 54.50, 81.36 and 51.12 is: 76.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.50 : 81.36 = 51.12 : x
  2. Step 2: Convert to fraction form
    54.50/81.36 = 51.12/x
  3. Step 3: Cross multiply
    54.50x = 81.36 × 51.12
  4. Step 4: Simplify right side
    54.50x = 4,159.12
  5. Step 5: Solve for x
    x = 4,159.12/54.50
  6. Step 6: Final answer
    x = 76.32

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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.