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Finding the Fourth Proportional to 54.75, 75.56 and 47.40

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Solution

The fourth proportional to 54.75, 75.56 and 47.40 is: 65.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.75 : 75.56 = 47.40 : x
  2. Step 2: Convert to fraction form
    54.75/75.56 = 47.40/x
  3. Step 3: Cross multiply
    54.75x = 75.56 × 47.40
  4. Step 4: Simplify right side
    54.75x = 3,581.54
  5. Step 5: Solve for x
    x = 3,581.54/54.75
  6. Step 6: Final answer
    x = 65.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.