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Finding the Fourth Proportional to 47.81, 65.97 and 28.14

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Solution

The fourth proportional to 47.81, 65.97 and 28.14 is: 38.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.81 : 65.97 = 28.14 : x
  2. Step 2: Convert to fraction form
    47.81/65.97 = 28.14/x
  3. Step 3: Cross multiply
    47.81x = 65.97 × 28.14
  4. Step 4: Simplify right side
    47.81x = 1,856.40
  5. Step 5: Solve for x
    x = 1,856.40/47.81
  6. Step 6: Final answer
    x = 38.83

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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.