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Finding the Fourth Proportional to 54.78, 81.80 and 48.23

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Solution

The fourth proportional to 54.78, 81.80 and 48.23 is: 72.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.78 : 81.80 = 48.23 : x
  2. Step 2: Convert to fraction form
    54.78/81.80 = 48.23/x
  3. Step 3: Cross multiply
    54.78x = 81.80 × 48.23
  4. Step 4: Simplify right side
    54.78x = 3,945.21
  5. Step 5: Solve for x
    x = 3,945.21/54.78
  6. Step 6: Final answer
    x = 72.02

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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.