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Finding the Fourth Proportional to 47.82, 71.79 and 47.72

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Solution

The fourth proportional to 47.82, 71.79 and 47.72 is: 71.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.82 : 71.79 = 47.72 : x
  2. Step 2: Convert to fraction form
    47.82/71.79 = 47.72/x
  3. Step 3: Cross multiply
    47.82x = 71.79 × 47.72
  4. Step 4: Simplify right side
    47.82x = 3,425.82
  5. Step 5: Solve for x
    x = 3,425.82/47.82
  6. Step 6: Final answer
    x = 71.63

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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.