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Finding the Fourth Proportional to 73.90, 110.85 and 19.79

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Solution

The fourth proportional to 73.90, 110.85 and 19.79 is: 29.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.90 : 110.85 = 19.79 : x
  2. Step 2: Convert to fraction form
    73.90/110.85 = 19.79/x
  3. Step 3: Cross multiply
    73.90x = 110.85 × 19.79
  4. Step 4: Simplify right side
    73.90x = 2,193.62
  5. Step 5: Solve for x
    x = 2,193.62/73.90
  6. Step 6: Final answer
    x = 29.69

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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.