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Finding the Fourth Proportional to 47.75, 65.79 and 45.54

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Solution

The fourth proportional to 47.75, 65.79 and 45.54 is: 62.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.75 : 65.79 = 45.54 : x
  2. Step 2: Convert to fraction form
    47.75/65.79 = 45.54/x
  3. Step 3: Cross multiply
    47.75x = 65.79 × 45.54
  4. Step 4: Simplify right side
    47.75x = 2,996.08
  5. Step 5: Solve for x
    x = 2,996.08/47.75
  6. Step 6: Final answer
    x = 62.75

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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.