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Finding the Fourth Proportional to 73.42, 109.45 and 67.66

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Solution

The fourth proportional to 73.42, 109.45 and 67.66 is: 100.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.42 : 109.45 = 67.66 : x
  2. Step 2: Convert to fraction form
    73.42/109.45 = 67.66/x
  3. Step 3: Cross multiply
    73.42x = 109.45 × 67.66
  4. Step 4: Simplify right side
    73.42x = 7,405.39
  5. Step 5: Solve for x
    x = 7,405.39/73.42
  6. Step 6: Final answer
    x = 100.86

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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.