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Finding the Fourth Proportional to 72.94, 109.43 and 38.73

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Solution

The fourth proportional to 72.94, 109.43 and 38.73 is: 58.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.94 : 109.43 = 38.73 : x
  2. Step 2: Convert to fraction form
    72.94/109.43 = 38.73/x
  3. Step 3: Cross multiply
    72.94x = 109.43 × 38.73
  4. Step 4: Simplify right side
    72.94x = 4,238.22
  5. Step 5: Solve for x
    x = 4,238.22/72.94
  6. Step 6: Final answer
    x = 58.11

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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.