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Finding the Fourth Proportional to 47.26, 65.20 and 28.85

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Solution

The fourth proportional to 47.26, 65.20 and 28.85 is: 39.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.26 : 65.20 = 28.85 : x
  2. Step 2: Convert to fraction form
    47.26/65.20 = 28.85/x
  3. Step 3: Cross multiply
    47.26x = 65.20 × 28.85
  4. Step 4: Simplify right side
    47.26x = 1,880.69
  5. Step 5: Solve for x
    x = 1,880.69/47.26
  6. Step 6: Final answer
    x = 39.79

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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.