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Finding the Fourth Proportional to 73.29, 109.71 and 72.21

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Solution

The fourth proportional to 73.29, 109.71 and 72.21 is: 108.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.29 : 109.71 = 72.21 : x
  2. Step 2: Convert to fraction form
    73.29/109.71 = 72.21/x
  3. Step 3: Cross multiply
    73.29x = 109.71 × 72.21
  4. Step 4: Simplify right side
    73.29x = 7,922.16
  5. Step 5: Solve for x
    x = 7,922.16/73.29
  6. Step 6: Final answer
    x = 108.09

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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.