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Finding the Fourth Proportional to 54, 80.64 and 49.68

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Solution

The fourth proportional to 54, 80.64 and 49.68 is: 74.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    54 : 80.64 = 49.68 : x
  2. Step 2: Convert to fraction form
    54/80.64 = 49.68/x
  3. Step 3: Cross multiply
    54x = 80.64 × 49.68
  4. Step 4: Simplify right side
    54x = 4,006.20
  5. Step 5: Solve for x
    x = 4,006.20/54
  6. Step 6: Final answer
    x = 74.19

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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.