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Finding the Fourth Proportional to 47.11, 64.99 and 30.73

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Solution

The fourth proportional to 47.11, 64.99 and 30.73 is: 42.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.11 : 64.99 = 30.73 : x
  2. Step 2: Convert to fraction form
    47.11/64.99 = 30.73/x
  3. Step 3: Cross multiply
    47.11x = 64.99 × 30.73
  4. Step 4: Simplify right side
    47.11x = 1,997.14
  5. Step 5: Solve for x
    x = 1,997.14/47.11
  6. Step 6: Final answer
    x = 42.39

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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.