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Finding the Fourth Proportional to 54.36, 81.14 and 48.21

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Solution

The fourth proportional to 54.36, 81.14 and 48.21 is: 71.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.36 : 81.14 = 48.21 : x
  2. Step 2: Convert to fraction form
    54.36/81.14 = 48.21/x
  3. Step 3: Cross multiply
    54.36x = 81.14 × 48.21
  4. Step 4: Simplify right side
    54.36x = 3,911.76
  5. Step 5: Solve for x
    x = 3,911.76/54.36
  6. Step 6: Final answer
    x = 71.96

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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.