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Finding the Fourth Proportional to 73.21, 109.28 and 68.62

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Solution

The fourth proportional to 73.21, 109.28 and 68.62 is: 102.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.21 : 109.28 = 68.62 : x
  2. Step 2: Convert to fraction form
    73.21/109.28 = 68.62/x
  3. Step 3: Cross multiply
    73.21x = 109.28 × 68.62
  4. Step 4: Simplify right side
    73.21x = 7,498.79
  5. Step 5: Solve for x
    x = 7,498.79/73.21
  6. Step 6: Final answer
    x = 102.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.