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Finding the Fourth Proportional to 73.72, 110.55 and 28.07

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Solution

The fourth proportional to 73.72, 110.55 and 28.07 is: 42.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.72 : 110.55 = 28.07 : x
  2. Step 2: Convert to fraction form
    73.72/110.55 = 28.07/x
  3. Step 3: Cross multiply
    73.72x = 110.55 × 28.07
  4. Step 4: Simplify right side
    73.72x = 3,103.14
  5. Step 5: Solve for x
    x = 3,103.14/73.72
  6. Step 6: Final answer
    x = 42.09

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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.