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Finding the Fourth Proportional to 54.60, 81.80 and 45.42

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Solution

The fourth proportional to 54.60, 81.80 and 45.42 is: 68.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.60 : 81.80 = 45.42 : x
  2. Step 2: Convert to fraction form
    54.60/81.80 = 45.42/x
  3. Step 3: Cross multiply
    54.60x = 81.80 × 45.42
  4. Step 4: Simplify right side
    54.60x = 3,715.36
  5. Step 5: Solve for x
    x = 3,715.36/54.60
  6. Step 6: Final answer
    x = 68.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.