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Finding the Fourth Proportional to 99.73, 149.32 and 72.73

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Solution

The fourth proportional to 99.73, 149.32 and 72.73 is: 108.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.73 : 149.32 = 72.73 : x
  2. Step 2: Convert to fraction form
    99.73/149.32 = 72.73/x
  3. Step 3: Cross multiply
    99.73x = 149.32 × 72.73
  4. Step 4: Simplify right side
    99.73x = 10,860.04
  5. Step 5: Solve for x
    x = 10,860.04/99.73
  6. Step 6: Final answer
    x = 108.89

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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.