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Finding the Fourth Proportional to 47.71, 71.49 and 20.65

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Solution

The fourth proportional to 47.71, 71.49 and 20.65 is: 30.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.71 : 71.49 = 20.65 : x
  2. Step 2: Convert to fraction form
    47.71/71.49 = 20.65/x
  3. Step 3: Cross multiply
    47.71x = 71.49 × 20.65
  4. Step 4: Simplify right side
    47.71x = 1,476.27
  5. Step 5: Solve for x
    x = 1,476.27/47.71
  6. Step 6: Final answer
    x = 30.94

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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.