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Finding the Fourth Proportional to 47.94, 72.11 and 40.38

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Solution

The fourth proportional to 47.94, 72.11 and 40.38 is: 60.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.94 : 72.11 = 40.38 : x
  2. Step 2: Convert to fraction form
    47.94/72.11 = 40.38/x
  3. Step 3: Cross multiply
    47.94x = 72.11 × 40.38
  4. Step 4: Simplify right side
    47.94x = 2,911.80
  5. Step 5: Solve for x
    x = 2,911.80/47.94
  6. Step 6: Final answer
    x = 60.74

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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.