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Finding the Fourth Proportional to 81.99, 123.12 and 73.18

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Solution

The fourth proportional to 81.99, 123.12 and 73.18 is: 109.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.99 : 123.12 = 73.18 : x
  2. Step 2: Convert to fraction form
    81.99/123.12 = 73.18/x
  3. Step 3: Cross multiply
    81.99x = 123.12 × 73.18
  4. Step 4: Simplify right side
    81.99x = 9,009.92
  5. Step 5: Solve for x
    x = 9,009.92/81.99
  6. Step 6: Final answer
    x = 109.89

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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.