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Finding the Fourth Proportional to 73.50, 109.89 and 69.81

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Solution

The fourth proportional to 73.50, 109.89 and 69.81 is: 104.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.50 : 109.89 = 69.81 : x
  2. Step 2: Convert to fraction form
    73.50/109.89 = 69.81/x
  3. Step 3: Cross multiply
    73.50x = 109.89 × 69.81
  4. Step 4: Simplify right side
    73.50x = 7,671.42
  5. Step 5: Solve for x
    x = 7,671.42/73.50
  6. Step 6: Final answer
    x = 104.37

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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.